I am very surprised at the number of foxes and the size of them in the UK.
Most foxes in the US, red fox or gray fox, are the size of a large tom cat, with longer legs, like 15 lbs, tops. A .22 WMR will flatten them inside of 100 yards. But yours appear to be a lot larger, so I can see why you are using .222 and .22 Hornet on them.
Coyotes run 30 to 70 lbs (rare), and bobcats 25 to 55 lbs, most of them in the middle of those ranges.