What shop in the UK is best for trying stage pianos?

I've been to the Roland and Yamaha shops in London, and I couldn't choose what was best out of the YC88 and V-Stage 88 because I couldn't do a side-by-side comparison. I also want to try the Casio PX-S7000, Dexibell Vivo S10, and pianos by Kawai, Korg, Kurzweil, and Nord. Now that PMT's gone, it looks like any piano shopping trip is going to be expensive and require planning.