Thanks for the comments. I agree with all you have said ie. trays etc and have being doing that. I do feed the hogs (de lux hedgehog food I am assured) which they seem to munch on quite happily. When I see them snuffling about I can stroll out and put some food down near them and they will finish it off. Continuing to chase the rat away when I see it, I think it is accessing the garden via the ‘hedgehog street’ hole, but want to leave that open for the ‘hog.
Time will tell – if I win or not. I would have though the hog should be hibernating by now (in Perthshire) but still seems to appear now and again.