@ruthkerruish looks like the sulphur cinquefoil is back, perhaps if these are dealt with before they seed then hopefully they can be removed for good. I think this is the same location as Potentilla recta (Sulphur Cinquefoil) ??
Ruth are you around today - I can come and remove these plants and check out your yellow box for Gang Gang nesting? Ciaran can you be around late this afternoon to check your hollows out?