Does anyone recognise this kind of bracket?

Nebbit

many; thanks to all those who have commented

Eldi_Dos

Hope you do not mind me mentioning but I would remove those screws while you can as after a few years weathering they are going to be difficult to undo.My preferred choice would be black japanned wood screws with brass cup washers, they will be easier to work with when it comes time to replace wood or remove brackets.

Nebbit

Eldi_Dos said:

Hope you do not mind me mentioning but I would remove those screws while you can as after a few years weathering they are going to be difficult to undo.My preferred choice would be black japanned wood screws with brass cup washers, they will be easier to work with when it comes time to replace wood or remove brackets.

Funnily enough those roundhead screws were bought from Screwfix only the other day and they are exterior grade screwed. You may not be able to see it in the pic but they are black japanned