Hi If the Denmark st shop doesn't have the MB gear you can get a Central Line to Liverpool st and go to the Bass Centre (although i would check they have stock first). Cab wise i have travelled on a tube with a MB 151P cab. its very small. If you wanted to try out a MB LMII i have mine at work and im in Holborn. EDIT: I would say hiring a car might be the best option. split a few ways it wont cost much and then maybe get something like an MAG combo. Ive used mine at loads of gigs without PA support but it depends on the type of music i guess. whats the drummer going to do to get to the gig?