No interactions present.
Simon, I can relate to your experience of the difficulty of gulls. This bird looks quite pale so have you ruled out Herring Gull? This is only a suggestion, I am not confident enough to say for certain
If so, what colour were the inner primaries?
Light coloured = Herring Gull
Dark like primaries = Lesser Black-backed
...but not well. Here's the only picture I got.
Lat/Lng: 52.8588, 0.4461
OS grid ref: TF647318