eteb3
I'm not actually sure there's anywhere called 'Achnashellach Forest car park' officially: seems to be a mere description, but it does crop up a fair bitso I'm not sure: it might be a real name, but in oral use only.

eg, https://www.walkhighlands.co.uk/torridon/Sgurrchoinnich.shtml
Email to me from the owner of the Carron Estate

https://forestryandland.gov.scot/visit/achnashellach implies that 'Achnashellach' is the name of the car park, but doesn't come right out with it.