Take the film as carry on luggage and it can go through the scanners in the UK they are 100% film safe. The chain hotels like Travel Lodge / Ravel Inn are basic good clean rooms at reasonable prices, Laterooms.com is a good place to search for hotels but outside London Bed & Breakfast places are a good bet as well. We rarely pre-book B&Bs just don't leave it until to late in a day.

If your near any of us let us know and I'm sure we'll show you around