Bkackcaps

I have had a blackcap visiting my London garden over the last two weeks and he can be seen daily, feeding on the suet balls and seeds which are available.

There is no sign of a mate and I haven't yet heard him singing.

What are the chances of him staying around and breeding or is it likely he's just passing through, albeit slowly?

And is a London blackcap unusual? I live between Brixton and Camberwell.