Hello Oliver, A good spot to visit is Severn Beach Near the 'New' Severn Bridge. There are walk ways bordering the severn just pick a bench and scan the river. I have seen Leach's Petrels & Skuas there in the past. Worth a go,good luck. Regards, Eian Wall.
Thanks Eian, I was thinking this would be the best place. I may try Sunday Morning when the wind and tide fits.