Hi Dean,
The Westminsters were on the ground floor room, about 3.5m x 4m, we sat about 2m away from them. The first thing that strikes is the sheer size of these beasts. They are BIG, measuring 1.6m high x 1m wide and weight about 104Kg each. They are very well made from solid Walnut, so I suppose the weight shouldn't be a surprise. The standard of build was simply fabulous.
As for the sound, it was simply amazing. I don't think I've heard a better pair of speakers. As Ian says, truly world class. The surprise, for me at least, was how well the bass was controlled. It was like there wasn't any. No overhang, no boom, even though the room was way too small and we felt that we should have been sitting about 2m further away from the speakers.
We (Ian, Neil, Thorsten and myself) were there for over 4 hours listening to a variety of music and they played everything well. The speakers never felt loud or strained, regardless of how high the volume was and at times it was loud enough to drown T's dulcet tones (only joking T

). These speakers allegedly go down to 18Hz but unfortunately we didn't have any tracks to test the really low bass. What we did have sounded great, whatever we played. The scale and dynamics were truly awesome and the sound so natural. If I had the money, space and a less "normal" SWMBO, I'd buy them and drive them with Ian's Leak very happily. With 99db sensitivity, Leak's 10WPC should be ample

. Source first?, wait til you hear these and then try to argue.
The prestige range of Tannoys come with fine adjustments of treble (+-2db I think), which we briefly played with along with the supertweeters and I think the effect of these was only apparent on a couple of tracks. Generally we didn't notice or paid attention to these tweaks.
I understand why the Japanese buy so many of these. I wonder how they'll sound in a large room with more space around them.
The Kensingtons were in the basement in a slightly bigger room. The first thing I noticed was how loud these sounded. The bass was boomy, almost like I was at home

. Ian has summed these up well. I don't know why they sounded so average, perhaps a synergy/room thing. The build quality of these was also very good. Neil did spot some Valhalla

.
I'll let Ian and Thorsten list the source and amplification.