5 Hr UK test?
Yes I agree, wrong to judge that someone needs at least 5 hrs training before the instructor has even flown with the PPL holder.
However, anyone who has experienced both JAA and FAA trainng systems (or UK and USA based JAA systems) cannot deny that there are major 'Procedural' differences (i.e the flying skills are the same, but the operational procedures differ).
If you want to fly in the UK after completing an American based PPL (whether that's JAA or FAA) it is prudent to get some sort of differences training. Otherwise you may find yourself unable to do an overhead join, or ask for a QDM for just 2 examples!
Whilst getting the cheapest deal is often appealing - the consequencies may prove rather expensive!
GQ (who has trained under both JAA and FAA)