Many of them were planted in a hedgerow bordering fields.
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Hard to tell with only the bark to go by. I have seen Field Maple and Elms with bark like this.
I'll try to get a shot of the buds. Perhaps that might help with identification?
A picture of the leaves under the plant would also help - as suggested above, it does have a touch of the elm about it.
There are a lot of elm around here that look a lot like that. The buds in your second picture look fairly elm-like too.
Nature's Calendar have a fun winter twig ID download with an elm example:
Lat/Lng: 50.9964, -1.3318
OS grid ref: SU469221