West KJ One , has Krell/ Wilson/ DCS/ Nagra/ Pathos/ Audio Resarch/ Copland, and more
North West part of town. 26 New Cavendish Street
Tel: 020 7486 8262 best to make appointments if you want to hear anything.
Walrus System, 11 New Quebec St tel : 020 7724 7224 in the same area. Again make appoitment. Tom Evans, Audio Note, Brikmann ( Hot ) pre-amp blows away Krell pre-amps, Avangard, Dnm, Neat, Michell ,Gamut, Chord, Turtable Store. These guys have excellent products.
230 Volts in the UK