There is a car park a short walk from the race start, which is behind the Toby Carvery on the A551.
Postcode for sat-navs: CH49 5LW
This one isn't exactly around the corner from us!
The nearest train station to Arrowe Park is Upton (Merseyside), which is about two miles from the race start.
To get to Upton from Manchester, catch a train from Manchester Victoria to Liverpool Lime Street, then board a service to Bidston, then finally change for a service to Upton.