I rang the mapping guy in my local council, and asked if there was any mapping info the council had copyright over. Apparently not. They used to do their own aerial stuff, but that's now outsourced; the rest is all OS derived. But he was quite interested generally (the council have their own GIS server, which seems very underused to me - at least the external part of it - but are being pushed to use google maps for their public-facing mapping. So once google go with map adverts, that's either the council advertising or my rates going up to pay google off). I'll probably try talking to them more; seems a good channel of communication to have, and I'm seriously confused by their policy on cycle routes, so can't really map them until I've talked to someone in the council a bit more.