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Thank you for the ID I was not too sure as this pair seemed bigger,and meaner looking,than the other Lesser Black-Backeds on the lake. But as you can see I have added another photo which shows the yellow of the legs threfore as you say Lesser Black Backeds.
Must admit I find gulls very difficult,I think I have them sussed then it all goes pear shaped.!
The immature bird being chased off could be a 2nd Summer Herring
Gull. Gulls aren't easy, especially in their various moults.
Lat/Lng: 50.9379, -1.5075
OS grid ref: SU347154