Generally, in my opinion, German and British lagers are quite different, and generally German lagers are good and British lagers are bad, apart from the odd exception (the Samuel Smith's lagers are exceptions in the UK).
I've heard of a lager produced by a small brewery in London which is gaining a good reputation, plus also Cain's lager is meant to be okay.
The likes of Carling (Canadian), Fosters (Aussie), Skol, etc. are poor examples of low quality "British" lagers.
DB.