This looks interesting, having done Action Challenge event's before they are generally well organised although a little costly at a £50 self fund.
Race summary: From the Racecourse Basecamp - the 25km loop (walk or run) heads along the Thames Path passing Alexandra & Home Park, with a pit stop for snacks & drinks near historic Runnymede, before heading to Windsor Great Park with magnificent views of the Castle. Then back to the Basecamp for the finish line celebrations.
Also not sure about three weeks to Bracknell Half...!?