Sorry, I was hoping your budget might be somewhat higher. The two brands I mentioned are based in the US, so of course, shipping and VAT will increase the expense to you.
![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
I'm not sure what brands to recommend that are readily available in the UK. Don't bother with Bose, of course: they spend their income on advertising, not product development. Pioneer might be appropriate: they're well known for quality speakers, although not so much for their in-home subwoofers. (They're heavily into car audio.) And, of course, you might want to investigate pre-owned equipment. That could stretch your budget quite a bit farther.