I like those permanently attached rear wheel locks. I have a small d-lock for the same purpose as well as a big lock for the front wheel and attaching the frame to the rack, but I have storage for the big lock permanently attached to the bike, so I only need to take a bag for the little d-lock.
Why is something in Blackpool on German Ebay? Also, 245 euro sounds quite a lot for a bike of that age, but I guess if there's life in that hub gear is could be worth it.