Try Clip Clops- although based in west Mids- she does everywhere (honestly!!) but will have to tie doing yours when she's in the area- shes called Clip Clops Clipping but I dont have my phone to hand to pass number on. She does my boy as I still (3rd year in a row) havent managed to service my clippers. Never seen such straight lines and tidy clip before!
There is a lady, Kerry Higgs, who does a the couple on our yard who don't do their own, I think she is on the Beds South PC committee so you can probably find her from there - she clips for a living and does seem to do a decent (if rather slow I thought ) job