ATW Middlesex Triathlon – 24th July 2022

18Days 06Hours 35Minutes 03Seconds

ATW Middlesex Triathlon


We are excited to announce the inaugural ATW Middlesex Triathlon at Merchant Taylors School, a stunning venue sitting on the Hertfordshire and Middlesex border surrounded by magnificent, picturesque grounds including manicured sports grounds, lakes, wildlife and greenery.

Swim in the most popular open-water venue inside the M25, and cycle a surprisingly rural route before enjoying a run around the picturesque grounds of this stunning school.

This is a mass-start non-draft legal event with starts from 7:15am.

This event is for athletes of all abilities and ages.

  • Location: Merchant Taylors’ School, Sandy Lodge, Rickmansworth HA6 2HT
  • Start times: From 07.15am
  • Distances:
    Triathlon Standard: 1500m Swim, 42K Bike, 10K Run
    Aquabike Standard: 1500m Swim, 42K Bike
    Triathlon Sprint:  750m Swim, 25K Bike, 5K Run
    Aquabike Sprint: 750m Swim, 25K Bike
    Triathlon Super Sprint: 400m Swim, 12K Bike, 2.5K Run

  • Minimum Age: Standard Triathlon & Aquabike: 17yrs (on 31/12/2022) ; Sprint & Super Sprint Triathlon & Aquabike: 15yrs (on race day 24/07/2022) Parental Consent required

  • Activity: Swimming, Cycling & Running

  • Open to: Solo participants and relay teams

  • Entry Fee: From just £47 per person (Details below – early discounts may apply)

  • Refunds: ATW does not offer refunds, transfers or deferrals for this event or any events listed on the website. If you are unable to attend due to illness, injury, family bereavement or jury service, you will only be eligible for a transfer or credit note on production of official evidence: Positive Covid-19 test result, Doctor’s note or equivalent.
  • Event Cancellation: If the event should have to be cancelled due to reasons beyond ATW’s control (for example – but not limited to – adverse weather, local or national lockdown) entrants will be given a credit note for the value of their entry fee (minus the booking fee) to be used on any ATW event.
  • Additional Fees: A 6% booking fee will be added at the checkout
  • Event Organiser: ATW
  • Organiser Email: events@activetrainingworld.co.uk
  • Official Event Website: N/A

Race numbers will be collected at the the event venue on the morning of the race.

Registration open from: 05:30am

The day license for Non-BTF members is included in the entry price.

There will be an online race briefing made available before the event, it is mandatory to have watched this as there will be no pre-race briefing on the day.

Please arrive in sufficient time to collect your race number.


The swim takes place in the beautiful Merchant Taylors Lake, popular with the North London open-water swimming community for its clear water and opportunities to spot local wildlife on the bank. The course will use a single 400m, 750m and a 1500m lap.

The bike heads out through the exclusive Moor Park estate (try not to let the multi-million pound mansions distract you from the task in hand!) before joining the main loop that winds its way up towards Harefield. This is where the SuperSprint will take a left-turn to shortcut the lap, looping round the back of Ruislip Woods Nature Reserve and returning through Bishops Wood and Batchworth. The SuperSprint and Sprint complete one lap before returning through the Moor Park estate, while the Standard will enjoy two laps of this undulating course.
Note that this bike course is on the public highway and you must be over 15 on race day to participate.
SuperSprint Distance GPX File
SuperSprint Distance Bike Video
Sprint Distance GPX File
Sprint Distance Bike Video
Standard Distance GPX File
Standard Distance Bike Video

After returning to transition on the school’s astroturf pitches, you’ll don your trainers for a 2.5km flat lap around the lake. The SuperSprint will complete this once, Sprint distance twice, and the Standard four times. This multi-lap route lends itself to great spectator support within the picturesque grounds.
Run Lap Video 


Swim: Open-water Lake
Bike course: Undulating and surprisingly rural roads considering it is held entirely inside the M25
Run course: Flat 2.5km off-road lap around the picturesque grounds and lake

We actively welcome support and involvement from local communities, businesses and individuals. If you would like to find out more about marshalling, sponsorship or group bookings please contact us at the address below.

Spectators are encouraged to attend to cheer on the participants and make it a day to remember.

If you would like more info on this event please use the email address below:



Custom designed medal for all finishers!
Add a medal insert to commemorate your time; whether it’s your first race or a new PB! Available to purchase for an additional £8.
Simply add MEDAL INSERT on your registration form and you’ll be sent the insert in the mail shortly after race day, for you to apply to your medal and display proudly!

There will be a prizegiving to the top male and female finishers in each race on the day

There will be full results on the chip timing website both overall and by category.



Whether this is your first event and want to know how to prepare, or you are looking to smash your personal best – following a training plan will increase your chances of improving your goals. We’ve teamed up with Chili Tri to offer plans that sync with your device and calendar PLUS you get daily e-mail contact from a qualified coach!


It is important that you are fit to run and have not experienced any Covid-19 symptoms in the 14 days leading up to the event.

Race Numbers
Please wear your number pinned to the front and back of your top or alternatively, using a race belt, rotate the race number to the back for the bike leg and the front for the run leg.

Yes – a fee may be chargeable on arrival

Changing Facilities
We will not be providing a changing area, therefore please come changed and ready to race.

Baggage Drop
There will be an informal baggage drop area for you to leave any belongings within the transition area.

There will be toilets available.

Water Station
Water will be provided on the run course and at the end of the race

By entering this event you agree to the below terms and conditions:

Your details will kept in accordance with the Active Training World Privacy Policy

Your name, date of birth, gender and email details will be passed onto Event Chip Timing.

Where specified on the booking form any medical information will be passed onto the medical team present at the event. 


1) I declare that I am medically fit to compete & understand that I do so entirely at my own risk.

2) I understand that I enter the race at my own risk and that no person(s) or organisation(s) will be held responsible for any accident, injury or loss to myself, prior to, during or after the event.

3) I am over the age of 17 (Standard Triathlon/Aquabike) as at 31/12/2022 or 15 (Sprint Triathlon/Aquabike) as at 24/07/2022 – Parental Consent also required.

4) I understand the organisers reserve the right to alter the arrangements and conditions, should circumstances require.

5) By entering this event, the athlete indicates acceptance of Brit Tri rules.

6) By entering this event, the athlete understands their relevant information will be shared with the medical provider, governing sports body and any other 3rd party deemed necessary by ATW for the safe running of the event. 


The event is being officially timed by Event Chip Timing and the results will be available on the day at http://results.eventchiptiming.com

Ticket Details

  • If this is your first registration on our new booking platform but had an ATW account previously, your old ATW log in details are now invalid and a new account will be created for you when you book your first event without logging in.
  • If you are booking more than 1 place, please ensure that you complete the individual details for each attendee accurately answering all the questions on their behalf.
  • Relay entries should be completed with lead entrant’s details only. Additional team members’ details will be taken at Registration on the day
  • The BTF Day License for the event is included in the price of a Non BTF Entry.
  • Prices do not include 6% booking fee. This will be added at checkout.
Details Price Qty
Standard Triathlon Non BTF Member£91.00 (GBP)*  
Standard Triathlon BTF Member£85.00 (GBP)*  
Standard Triathlon Relay£105.00 (GBP)*  / bundle 
Standard Aquabike Non BTF Member£81.00 (GBP)*  / bundle 
Standard Aquabike BTF Member£75.00 (GBP)*  / bundle 
Sprint Triathlon Non BTF Member£76.00 (GBP)*  
Sprint Triathlon BTF Member£70.00 (GBP)*  
Sprint Triathlon Relay£90.00 (GBP)*  / bundle 
Sprint Aquabike Non BTF Member£66.00 (GBP)*  / bundle 
Sprint Aquabike BTF Member£60.00 (GBP)*  / bundle 
Super Sprint Triathlon Non BTF Member£55.00 (GBP)*  
Super Sprint Triathlon BTF Member£49.00 (GBP)*  

Price does not include booking fee

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