deterring foxes from turning my garden into a den ?

I have posted before about the family of foxes living in my elderly neighbours overgrown garden but things have recently taken a turn for the worse. We have a very small urban garden (neighbours garden where the foxes live is large and totally wild so they seem to have plenty of space). Our garden has a 6foot concrete wall all round it, and a small patch of grass in the centre with flower beds at the sides.) They jump over the wall easily.

We often see the foxes playing or sleeping on our lawn in the summer. However we have just got back from a week's holiday and in our absence the foxes seem to have made a takeover bid. There is a substantial hole tunnelled under the wall to our elderly neighbours and another hole started on the opposite bed. There are fox toys on the lawn including a ball, a chewed blanket and a large man's new looking boot. The whole garden stinks of fox. There are large fox poohs right outside my back door and all around the garden.

I spoke to my neighbour on the other side who has a small town garden entirely paved. His garden is also surrounded by a 6foot concrete wall topped with another three feet of trellis which he recently replaced. He said in recent weeks foxes have defecated on his paved areas and repeatedly jumped onto his trellis fencing to get into my garden, indeed they have broken it in one place. He said this has only just started.

I don't know why my garden is so attractive to them, there is no food around, none of us feed them on or leave food out including elderly neighbours and this year for the first time my apple tree did not fruit. None of us use blood or bone fertiliser. I am at a loss how to deter them. I have tried Scoot, ultrasound, even OH relieving himself. It makes no difference.

Has anyone got any suggestions? Have they overgrown their current den and are trying to expand next door into mine.? Is it a fox turf war? The only thing I can think has changed is my neighbours at the end of the garden have got a dog recently. Maybe this means the foxes cannot hang out in there? Also do they normally nest build at this time of year?.

Please do not give me a lecture on what wonderful gentle creatures they are, My garden stinks and is covered in fox pooh, and I have two very small grandchildren who like to play out there. I just want them to nest somewhere else. Any suggestions of anything that works?