DFC is wrong, I and a number of others have it in WRITING from the CAA that they are ADVISORY limits and not legal limits. The only LEGAL limit is the 1800m horizontal vis.
There is a lot of myth generated on these and other forums. Dont you know it is a great British tradition to make up new and ever more restrictive laws and live by them? The French have many flaws but at least the know when to ignore stupidity.
Someone pass me the salt please.....