Hi, decided not to bother with the Halfords kit after speaking to a few people. Reason being, you can't see any leaks, so to spend £40 and then find in a week or so the same thing has happened is a bit like pumping air into a tyre with a puncture, only air is free.
Instead I found a local garage who do a complete A/C service for £65 and can even put a UV dye in the system which will show any leaks should one occur in the future. So it does pay to look around and save some of the hard earned £££s.
The other thing that puzzles me is why do LR dealers charge so much, if a local 3 man garage can do it for less than half price??