When I liveried near Colchester I used David Ticquet for remedial farriery - was recommended by my vet at the time. Not on the same side of the county as you but a long shot if you are stuck. Tell him Sebastian sent you!
When I lived there, I used Dan Brown. Very reliable. I think he cut back a bit on clients, but is on FB. He may recommend someone if he can’t help you himself.