I'm going to London today, and have a little time to spend off topic, so I was thinking of heading to a shop selling keyboards. I quite like the Nord keyboards,but want to compare with other makes.
Denmark St, near Tottenham Court Rd tube, used the be the place to go. There are still some music shops there, but they are being crowded out by hipster food places, sadly. Worth a visit if you're in the area.
Get a copy of Sound on Sound or similar mag, and see all the ads in there. I used to do that, then on my trips to London, have a gander at them all for real.