I think these are swallows (but could be housemartins- help please)
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They are indeed swallows, house martins have white faces and shorter tails. You ought to add your identification now.
Matt, note that barn swallow is just another name for the usual European swallow. Carstairs added his ID because you had neglected to add the scientific name. This is done for you when you click on the "get recommended" button. It then adds other observations below so you can check that yours looked the same as those seen by others.
Lat/Lng: 52.453585, 1.324832
OS grid ref: TM260891