Long Tailed Field Mouse

Came across this little chap (?) ferreting around the loose stones on the side of a country lane near Purleigh in Essex.
He would have fitted quite comfortably in the palm of my hand ( with room to spare ) and was kind enough to stay around long enough for me to get a couple of shots.
I think that he’s a Long Tailed Field Mouse, but as always, I’m willing to be corrected.