I wouldn't bother with the Cambridge audio power amp mentioned. Especially since it's not going to fair as well as lots of much better quality amps a bit more expensive and within the budget. I'd be trying brands like musical fidelity, naim, Cyrus, leema etc. I'd avoid brands like roksan and Rotel and Cambridge audio for amplification. They tend to occupy budget ends if market. Roksan is not quite as dynamic as these other brands and is a bit lazy in bass which is its reputation, Brands from likes of musical fidelity and leema are some of the best you can get at their price, Cambridge audio isn't in the class of these brands on amps, sources yes. I'd add rega but you want a much better intergrated than the elicit r.
The reason the Cambridge audio is doing well in the us is probably because they like huge power amplification but I'd be dubious about the Cambridge audio doing sound as well with such a huge power output for such a price, which to do it much better its usually the preserve of much pricier amps. You also don't need all that power at normal listening levels, so go for all out quality in the brand. I'd be thinking of distortion and just being too forceable a sound with all that power and there probably wouldn't be much control of bass. If I was you I'd try some intergrated amps around £2500 and go upwards from there in trials, as some of them will outclass that Cambridge audio amp by quite some margin. A Cyrus stereo 200 will be a lot better amp than that Cambridge audio around the same price, and you could add a pre dac. But I think some form of decent intergrated is the way to go I think, as the pricier ones are just as good as pre and power amp combos.