We headed off down Regent Street and came across more and more Father Christmas'.
Intrigued I googled when I got home and discovered that we had walked into Santacon. Santacon seems to be a gathering of people, dressed as Father Christmas intent of spreading Christmas cheer. It was interesting to see, but despite Kit screaming 'Father Christmas' several times, not a single Santa paid the slightest bit of interest in him. Not a single Santa actually seemed to interact with any child I saw, so I wouldn't go next year expecting what the website suggests of santas singing carols and giving out treats, they were very much keeping to themselves.