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Tricky one this ! 

You've done all the right things and had it checked out.  If the pressure test was OK then the pipe-work would be sound so there seems to be only 2 possible causes.

1) There is a leak from the bottle --  Highly unlikely I would have thought.

2) There is a leak where the pigtail screws into the bottle.  Perhaps a bit of grit lodged in the joint.

Hope you find it

DaveS1

I had the same problem and mine was the pigtail screw junction with the bottle,it wasn't tight enough.

Saxo1 

I had a similar problem a few years back but what I did was change the type of regulator from a hexagon type to a hand wheel type. The bull-nose end on the hexagon type is brass so the connection is reliant on a metal to metal contact whereas the hand wheel type has a rubber bull-nose which not only creates a better seal but you don't need the use of a spanner to make the connection either. It solved the problem once and for all for me but I thought I would mention it as it could be the minor solution to a major problem. See the links below of the two different types.

Hexagon Type: http://www.amazon.co.uk/Regulator-Suits-Calor-Gas-Propane/dp/B000YKXPXU/ref=sr_1_6?ie=UTF8&qid=1342371817&sr=8-6

Hand-wheel Type: http://www.amazon.co.uk/Royal-Propane-Regulator-Handwheel-8mm/dp/B00448EV40/ref=sr_1_9?ie=UTF8&qid=1342371817&sr=8-9