Stewartby Triathlon

11th July 2021.

Starting from 07:00am

This event is organised by Active Training World

Stewartby Triathlon


Located at the Stewartby Sailing Club, in Bedford, this venue is perfect for triathlon. You will be treated to a dip in the beautiful lake waters, followed by a very fast, flat, lapped road bike course (in fact we’d say its the fastest triathlon road bike leg in the country!), finishing with a scenic, traffic-free run on paths alongside the lake into Marston Vale Country Park.
Options available for Standard and Sprint, individual and relay, triathlon and aquabike.

The event will start at 07:00am, with registration open from 06:00am.  All events will take the style of a time trial with the fastest athletes starting the swim first, based on the estimated swim time given when entering. This format may change depending on the Covid restrictions in place at the time.

Many people are understandably nervous regarding entering events again and we want to assure you that we take every measure we can to organise a safe, socially distanced event. To see this in action watch our video Covid-19 Safety at ActiveTrainingWorld Running and Triathlon Events

We want you to book with confidence so, if this event can no longer go ahead, and an alternative date isn’t found, you will be offered a virtual run or a refund of your entry fee. (Booking fees are non-refundable)

Sunday 11th July 2021.
Start Time: From 07.00am 

LOCATION: Stewartby Lake, Green Ln, Bedford MK43 9LY

Online entries: Pay by major credit/debit cards



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

Registration open from: 06:00am 
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.


Book your place

  • 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


Details Price Qty
Stewartby Triathlon Standard Entry Non BTF Member £76.00 (GBP)*  
Stewartby Triathlon Standard Entry BTF Member £70.00 (GBP)*  
Stewartby Triathlon Standard Relay Entry Non BTF Member £76.00 (GBP)*  / bundle 
Stewartby Triathlon Standard Relay Entry BTF Member £70.00 (GBP)*  / bundle 
Stewartby Triathlon Standard Aquabike Entry BTF Member £60.00 (GBP)*  / bundle 
Stewartby Triathlon Standard Aquabike Entry Non BTF Member £66.00 (GBP)*  / bundle 
Stewartby Triathlon Sprint Entry Non BTF Member £66.00 (GBP)*  
Stewartby Triathlon Sprint Entry BTF Member £60.00 (GBP)*  
Stewartby Triathlon Sprint Relay Entry Non BTF Member £66.00 (GBP)*  / bundle 
Stewartby Triathlon Sprint Relay Entry BTF Member £60.00 (GBP)*  / bundle 
Stewartby Triathlon Sprint Aquabike Entry Non BTF Member £56.00 (GBP)*  / bundle 
Stewartby Triathlon Sprint Aquabike Entry BTF Member £50.00 (GBP)*  / bundle 

Price does not include booking fee



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 strongly discouraged from attending while Covid restrictions are in place,

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


Custom designed medal for all finishers! 

There will be no prizegiving on the day but you will be able to collect your medals.

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

Course Information


Swim: The swim is a 750m loop of Stewartby lake. The sprint distance consists of one lap of this loop, wheras the standard distance is 2 laps.

Bike: The bike course heads out onto a fast and flat road where you will complete either 2 or 4 laps for the sprint and standard distances. As per the map, the sprint distance totals 20Km and the standard distance totals 37Km. Click the map for the full size image

Run: The run heads along trail paths alongside the lake into Marston Vale Country Park. It is a 5km out and back course, which you complete once in the sprint race and twice in the standard race.Click the map for the full size image


Training Plans

 Need help with your running? Whether this is your first triathlon and you want to know how to prepare, or you are looking to smash your personal best – following a training plan is the best way of achieving your goals.

Visit the ATW Shop to submit your requirements for a fully customised training plan.


Other Race Information

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 on your back for the bike and your front for the run.  A race belt can be used instead.

Parking is available near to the lake with a £2 charge payable at registration

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.

Dogs & Buggies
No dogs and buggies allowed

If you are unable to attend due to illness, injury, family bereavement, jury service you will only be eligible for a refund on production of official evidence: Positive Covid-19 test result, Doctor’s note, Death Certificate etc.

Event Cancellation
If the event should have to be cancelled due to reasons beyond ATW’s control (for example, severe weather, local or national lockdown) entrants will be given a range of options to choose from, which will include a refund of their entry fee (less the booking fee).


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 and email details will be passed onto the chip timing company. Personal details will be deleted 1 week after the event.

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


1) I am 15 years or over as at 31/12/2021 (Sprint Distance) and 17 years or over as at 31/12/2021 (Standard Distance). 

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

3) 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.

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

5)  By entering this event, I accept BTF rules.