There are many UK Universities that do a PhD by publication and if you did a google search you would find them and can include the likes of City Uni, UEA, Sunderland, Kingston. Even Cambridge has one by 'special regulation' but only offered to its own grads. Its not hard to find them, but it is hard to complete the works. Naturally people are sceptical but its as valid as the traditonal route and perhaps less costly.