Parking for the CITO:
I think the idea is that cachers walk
from the Mega/town centre to the CITO over the railway and from there back to where their transport is.
I'm parking at the P&R (51°43.755'N, 1°14.929'W) £1.50/day and £1.70 for the bus into the town centre but I might not be using the bus.
If you want free, try 51°44.205'N, 1°14.454'W which is rough ground parking suggested for GC12CVG or street parking in New Hinskey but I know there is a lot of resident parking only.
South Hinskey is very poor for parking with narrow roads but there is a few spaces by the CITO co-ordinates but these may be taken by residents. It was parking for the now closed pub, I've used it for the cache on the footbridge GC3A76J which was placed from a boat