The owner makes the hoods on site and also supplies to the trade too. I bought my mohair hood from them 4 years ago and its as good now as when it was fitted. They also re-trimmed my seats last year too. The hood would take them around 4 hours or so to fit so you could drop it off and wander round Romford.
These two firms are both local to the central Norfolk / Norwich area. I have no personal experience of either of them but have heard positive reports of both. May be worth you at least giving them a call. You also have the option of buying a new hood from any one of several suppliers (google search the web) then just looking for a local firm to fit it.