Leucistic gull or hybrid iceland x herring gull

A leucistic large gull or maybe hybrid iceland x herring was on the tyne at stella today, maybe this is the bird seen at north shields? i thought it was an iceland gull at first, it looked like a 2w iceland gull, but rba said it wasnt an iceland. They said it was a leucistic large gull, but couldnt say what species? Just maybe a herring.

This could be the north shields bird as its not reported at North Shields when it is in Gateshead (mid week)? would be interested to hear from someone that's had the bird at North Shields.