What is the best amplifier for Tannoy Kensington ?

BAT vk-55se will be fantastic

Well I will repeat that the 8 watt Sophia Electra mono blocks are the best that I have heard the Kensington's sound. Now unless you have an auditorium to fill they should be fine.

I own the yorkminster se's and have successfully powered them with an el84 amp of around 10watts. Tannoys don't need lots of power contrary to some folks suggestions. I agree they probably sound different with 200 watts of ss power, and some folks may prefer that, but they don't NEED it.

I will soon have a pair of Kensington GR. I’d like to drive them with the 15 watts Leben for downsizing and simplify my system. Does anyone have any experience with that kind of marriage ?

The Leben amplifiers are pleasant to listen to but not highly resolving - I've heard them on the the Kensington's. The Kensington's deserve better - look at Shindo/Air Tight.