A couple of days ago I installed a large mesh Ground Guard from CJ Wildlife. It comes as a flat pack which is easily assembled in a few minutes to make a safe area for smaller birds which like to feed at ground level but prevents the larger birds, especially Wood Pigeons, from hogging all the food. There is a lid on the top which made it easy to put a tray of seed and a suet slab inside.
First to try it out was a Robin but so far it has been mostly used by the Blackbirds. It is amusing to watch the Wood Pigeons circling round the guard trying to find a way in and failing. I had hoped the Pied Wagtails would use it but I haven't seen them for a couple of days.