Wow! I've got it back
Just as Flecc said earlier in this thread, someone contacted 50 Cycles looking for a battery lock and a charger. They smelt a rat. What's more, he'd sent them a photo, which Tim Snaith, a Director of 50 Cycles fowarded to me - and by jove, it did look like my bike - a number of small details tallied . They hoped the chap would take it into their Hampton Wick shop but he didn't do that. Tim forwarded the chaps details to me and I in turn forwarded them to the Police.
The latter worked with astonishing efficiency and alacrity. I contacted them at 2pm yesterday; a DS at Charing-X contacted me 6-ish, asking me to forward the image Tim had sent me and my own images of the bike. That I did. They seemed to convince them it was worth investigating and at 10 I got a call saying they had the bike!
Today I went to pick it up. The battery lock is damaged, there a few accessories missing and a few scratches but beyond that, it seems relatively unharmed. It's certainly rideable.
I'm a lucky bunny. And all down to that 50 Cycles magic
and remarkable efficiency by the Met, especially I think one DS at Charing-X, whose job seems to involve cycle theft and he seems to take it seriously