If you have smaller acoustic space in, say, a modest smaller flat, I'd say you'd probably do good with some acoustics friendly Kef UniQ driver, coaxial, something'er-other's, matching center and or surrounds, and stay with your favorite British amplification, integrated, etc. Then, as you say regarding the lack of UK based Surround soundy gear, I recommend you loop a good HT digital processor for Dolby/DTS Master surround, into your two ch pre and or multi-channel amp setup, and look for budget. What comes to mind, is something like Emotiva $699US prepro, with EQ. Probably do plenty for your movie application, and then you switch it out of the loop for your 2 ch British sound duties.
Pretty sure you'd be happy this way. Peace...