Yes, that's a very nice bike. I bought one when I was in Cambridge for a steal (£100 is by eBay standards anyway!), cleaned it up and rode it for a while then sold it to another very happy eBayer (for a profit too) to finance my Explosif. It's still the one bike I may go for again - and Sinnermans is exceptional...
Yeh, Sinnermans clockwork is pretty amazing alright. It'll take some work for someone to create a nicer Clockwork than that. If this wasn't being used as a work bike, I'd love to lavish some nice shiny bits and a new paint job on her.