Grey / Brown - Goose?

Hi All,

Whilst taking a short walk on my lunch break, I encountered this bird which I assume is a goose of some kind. Having looked through the bird identifier, I can't quite find anything which is an exact match, especially with the grey feathers on its wings. It is slightly larger than the mallards around it.

The pictures aren't the best - but hopefully clear enough. Thanks for any guesses in advance!