This probably isn't what you're looking for, but if I post it here then I might find it at a later date. Steven Bull on 07850328983 is a restoration builder. He works in lime plaster, suitable for historic buildings. I haven't used him. He is currently working on a marvellously tumble-down early Georgian house just off Borough High Street and is doing a fine job there. He tells me he is recommended by SPAB.