Not being cheeky but as I commented before that says all that needs to be said - it doesn't say the rating is not valid outside the UK, it does say what the entitlement is within the UK.
The other reference originally came form LASORS 2010
LASORS 2010: the guide for pilots - Civil Aviation Authority: Personnel Licensing Department - Flight Crew - Google Books
but hence my earlier comment that it is the ANO that is relevant.