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Hello Steve, it is certainly a grass snake. If you click "add a Revision" you can identify it as such with the scientific name Natrix natrix. Other people will agree it and you will increase your reputation in amphibians and reptiles. If you don't, I'm sure someone else will...
P.S. Was this photo taken at night?
Yes, most of my photo's are taken at night, it was a very balmy night though. Concrete yard holds heat in from day so quite common to see snakes using them as warming aids.
Lat/Lng: 52.9, -1.9
OS grid ref: SK0942