Sounded like hobbits in hob-nailed boots on the roof.
Bloody pigeons - a neighbour keeps some of them.
Often a huge crash as a magpie lands but this was different, has been happening for the past few weeks now.
They seem to be feeding on the moss on the tiles.
Also seems that I need a roofer to re-point the ridge tiles

Barge boards looking sorry for themselves too.