That must be because the UK CAA insists on republishing and changing a lot of rules (LASORS), and making there own ratings (IMC rating). Not sure if that has become any easier with EASA rules.
LASORS ceased in 2012! It was replaced by CAP804 which has now been replaced 5 times. One of the major issues is too many sources of information, much of which is contradictory, poor indexing of information and a failure to check content before publishing.