Alzheimer’s Research UK stand for everyone affected by dementia. By fundraising for them you can take part in a sport you love, at stunning locations, whilst helping to raise research funds that benefits all of our futures.

TTH specialise in innovative coaching for individuals and groups. They offer coaching support to our athletes including race specific training plans, pre-event training sessions and a virtual training club.

Take the hassle out of travelling with a bike and hire one for race day. On Your Bike's team of mechanics will be on hand for any fitting adjustments, pedal changes or installation of extra parts that you may want.

Need to hire a wetsuit? This is really easy, quick and affordable solution for making sure you have a high performance, technical Yonda wetsuit for race day. Simply enter the discount code CASTLE10 on the check out page to get 10% off!

Winner of 'Best in Test' sports bras three times! A female empowerment sportswear brand revolutionising sports bras with their unique Overband® Technology.

Get stocked up on BeetActive and CherryActive concentrates, the perfect natural pre and post nutrition pairing enjoyed by leading endurance athletes, football, rugby and Olympic teams.

Born in Japan in 1911 SWANS has been making swimming goggles a long time. They are passionate about designing and manufacturing the highest quality swimming goggles for every type of swimmer. Use Discount code Castle20 at checkout for 20% off. T&Cs apply.

Make sure you're covered for any unforeseen circumstances. Yellow Jersey have a number of different options for event day cover, bike damage or theft and reimbursement due to injury.

Look the part when you're training in one of our Castle Race Series t-shirts. Share your photos using #CastleRaceSeries so we can see you in action.

High Performance for Athletes — UVA & UVB protection from the sun, Pelotan is lightweight, breathable & sweat resistant. Providing high performance protection for athletes so you can do more of what you love.

Castle Race Series participants will receive 10% Off any Turbo Trainer Hire. Simply enter the discount code CASTLETURBO10 on the check out page. Turbo Trainer Hire offer a friendly and helpful service on a range of quality performance turbo trainers from wheel on to direct drives. With flexible hire periods, affordable prices, with no deposit and easy online hire process this is the ultimate try before you buy

Looking to buy a wetsuit? Yonda wetsuits are built with technical neoprene panels, the right balance of flexibility and buoyancy and will aid your swim style.