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Could be a den under the neighbours shed, they aren't cubs though, they're full size. I bought some of the chemical repellent and also this noise machine that send out a sound 'only foxes can hear' when they set off it's motion sensor.
Have you used any of these yourself?
I read that male urine can help, anyone tried this?
I also moved all the plant pots and garden furniture into what looks like their chill out spot. Hopefully that should throw them until the serious stuff arrives.
You're fucked, basically. The damage sounds like cubs playing, which would mean there's a den nearby. There's not a huge amount you can do except wait for them to grow up and fuck off, or move house :/
You could try getting onto the council to get them to tell your neighbours to secure their rubbish better, but this is London, my friend, and if the council even bother, they will be ignored. Like Clockwise says, you can buy chemical fox deterrents but by all accounts they're of pretty limited efficacy.