Is this a common gull, kittiwake, herring gull or something else?

For over a week now, this bird has been spending its entire days completely alone perched on a street lamp and stomping for worms in the grass.

It flies away at night but comes back every day without fail.

We are 14.5km from the coast so we wonder whether this bird is lost and why it is alone.

Should it be reported to the RSPB?