Lone Afternoon Gull

I got a shot of a cormorant heading for the lake this morning but it wasn't great. Didn't get the chance for photography again until late this afternoon owning to dealing with a man who is going to repair the back door lock and making phone calls regarding the mountain of admin that I have to do. I snapped this lone large gull. I'm not good at identifying gulls, I think it could be a lesser black-backed.