Yes the Watchams are still in Cossey on the 1851. This time Black Swan stands alone so I think it was the name of the pub, especially as Millipede says the occupier is an innkeeper and labourer.
Perhaps in those times Cossey was so small and everyone knew each other, so there was no need for formal addresses.
Will have to leave their address as Cossey.
Many thanks for the replies, much appreciated.