Hi Piratesfan123
Welcome to Birdforum! 🙂
As the others have said, these are Egyptian Geese.
They were originally introduced to the UK as parts of Wildfowl collections for their rather attractive and exotic plumage way back in C17th. There is now a substantial feral population breeding in Norfolk of over 1,000 pairs (where they originally took foot in the wild) and they are quite abundant in London and the Home Counties as well as a population growing in the East Midlands. As far as being ‘invasive’ there’s no evidence they are cross breeding with native geese or competing for habitat but the populations are expanding so time will tell. The winter weather acts as a natural population suppressant since Egyptian Geeses breed in late winter rather than the spring compared to other Geese (although Climate Change might be improving chick survival). Egyptian chicks running around on my local patch is a regular sight in early to late March. As far as ‘invasive species’ go though, they are, in their current nembers, relatively harmless.