Please see this post which I got from both Gaslow and UKLPG.ORG by all means don't take my word for it, you will find it there http://www.motorhomefun.co.uk/forum/threads/refillable-lpg-tank.111694/#post-1479085
Just read it. Can please help me as i cannot find where it states the filling point cannot be in the locker.