Thanks for the reply Eric. Good suggestions but I don't think that set up will work in my case because I'm thinking of either a traditional vintage style ceiling rose, with a long flex to meet the light, or a 'regular' rose or with a different colour cover. e.g.
http://www.ebay.co.uk/itm/Solid-Brass-C ... 3hfdEM049Q
or
http://www.ebay.co.uk/itm/Black-Plastic ... 1843824418