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This is very much an MK forum as the UK dealers are very active and do a good marketing job. That is not necessarily a bad thing though as MK speakers are good (i own them myself).
I am not familiar with the gold onwalls but the in room are good speakers but are large. If you can accommodate big speakers then I think they always have an advantage over smaller satellites even with modern eq and high end subwoofers. I'm not sure where you would demo them in the UK or what the current prices are. I heard them when in the US and they were pretty popular there.
You should have no issue finding the MK to demo in the UK and they have some very good practical options for a typical UK sized rooms. The MP950 looks to be a good addition to the range.