I know that some birds do, and I can see 2 constructions from my bedroom window, but not seen them at it at the same time. Having said that, THere are at least 2 Males & females around here so it's just as likely that they are individual nests.
One of the nests is in the Ivy on my fence (which I was about to cut well back!!). You may remember that a nest was built last year ( http://www.thamesvalleybirds.co.uk/b...e-nesting.html ) but abandoned (I think after a cat got on top of the fence and the birds choose discretion over valour )
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