[KevinW]

other members have:

built their own garage
used a marquee style tent
done it in the open air (only for the hardiest constitution)
rented a lockup (maybe issues with mains power/security)
rented barn/pigshed/disused industrial unit etc
rented a garage from a mate
scrounged unused space at work

Surrey is a big place - maybe you could be more specific?
there are a few of us in the farnborough/aldershot area, 'just over the border'

Kevin