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I found out from a neighbor that our vets do treat wildlife, however you have to catch it and take it in, so unlikely with a fox!
Good news is I've not seen the fox since.
I'm hoping that it was just a strain and has healed itself.
I pass same spot every day and night so look otu fro it but no sign.
I saw an injured pheasent being attacked by a raven or crow the other day!
Stopped and scared it off, then rang wildlife hsopital and said would come get it.
Just before they got there, the pheasent flew off a bit into the bushes!
lets just say I got very muddy and was late for work, so sometimes i think best leave them to own devices!
The wildlife place were very good thow, so know who to call next time.