If you're after warmer amps, maybe consider:
Arcam A39
Marantz PM8005 (although this is significantly cheaper than the others here, I think there are forum members who have this combo and rate it highly)
Peachtree Nova 220SE (has switchable tube pre-amp that could increase the warmth if it's not enough for you with certain music. Also includes a DAC and is very powerful. An excellent value bit of kit IMO).
As always, demo demo demo before purchasing. In the case of the Peachtree this might mean travelling some distance, but surely £50 on fuel is worth it when you're making that sort of investment.
Certainly my experience of the Hegel was that is was quite forward and clinical, so might not suit what you're looking for. Have you actually bought the KEFs yet?
Rather than limiting yourself to one pair of speakers, it might be more productive if you just try a handful of dealers near you, explain the sound you're looking for and the music you listen to (take your music with you) and let them come up with some suggested combinations. They may come up with options you may never have considered that meet your needs spot-on.