Carplus were looking for volunteers to do short study/film about how car sharing has worked for them. Contact marketing@citycarclub.co.uk. Apparently there are 5000 members in Edinburgh
City Car Club also offering reciprocal membership with Brompton Dock for £1. Both operations have locations around the UK.
Hiring a car club car for a couple of hours can actually work out cheaper than using left luggage services at a station. Small car costs less than £5/hour. Handy when in London.