Bark gnawed is rodent (small, like voles and mice, or medium, like rabbit), or deer. Garden enclosed says to me VOLES. Very few options. Look for holes in the ground, especially near rocks/stones under which little creature can dig away unnoticed and warm and dry

Desperate foreign squirrels have moved into neighbourhood under new EU regulations! Sorry not to be more helpful but they're all I can think of that will scale the fences. Welcome to G o Y anyway.

Sounds like squirrels, especially the grey squirrels that have been introduced to the British Isles. They are aggressive and cause a lot of problems to the environment and kill off our indigenous brown squirrels. They are classed as vermin, so if you see one kill it. The only good thing is they make nice eating ;o)

I agree could be voles and you can stop them by putting chilli powder round the base - worked for us. Some people prefer flakes as they withstand rain better but we stick with the powder. and if you sprinke it on the foliage as well nothing will come back for seconds.

Thank you all. I think probably this must be voles as suggested. Perhaps a few times a year we have a visit from a grey squirrel but I suspect my ever present dogs deter it. However I do have a lot of voles and the dogs try to dig them out! Don't know why the voles should suddenly have attacked the juniper. Like the idea of chilli powder/flakes but not sure if the dogs could tolerate it!