Ended up being Chris, me, Blondechris and Tyrrell in the end. As the estate agents say "location, location, location". It was my first time there (now I have reliable transport to trek about in) but it's kind of huge and the inter-level access isn't too hot, so I must have spent a good half hour or so swanning about looking, both in car and on foot. I''ll know for next time. Blue car park, level 1 (middle) section N or thereabouts.