Go to this link for Cornwall Model Boats "www.cornwallmodelboats.co.uk". I know they are in Treknow, Cornwall but have no idea where that is in relation to London. Perhaps an email to them with your intentions will get you information to a brick and mortor address. I order from them occasionally and know others who do, they are very nice people and quite knowledgeable.
You may want to try JoTiKa Ltd., Model Marine Warehouse, Hadzor, Droitwich, England. Their web site is http://www.jotika-ltd.com/Pages/1024...okit_Front.htm
. There is even a map of their location on their website.
A third suggestion is Westbourne Models and Kingston Mouldings, their website is "www.modelboats.co.uk/news/article.asp?a=585". Their shop has got to be fantastic. If you go there on the web and browse the different pictures they post, look in the background at their shop. I don't know if it is large or small, but it has to be packed. They are located at 411 Ringwood Road, Parkstone, Poole, Dorset BH12 4LX, Tel/Fax: +44 (0)1202-744716.
Hope you have a great time in and around London.