OK, after asking the question here and elsewhere, and accepting that I can't possibly hear all contenders (especially these days) I decided that I'd go on consensus and similarity to what I've currently got, and have ordered a Radford Revival STA25 mark 5. I've heard nothing but good things about these amps, it will be easily able to drive the Tannoys, and it's within budget (and seemingly built to an extremely high standard).