The plot thickens........
Something rattling round in the tank, turns out to be this........looks like an old lead washer ? Where from ?
Tried to take out the NRV but cannot seem to seat the tool on it, mine seems to be 5 mm slot width but the valve looks a bit wider, is that possible ?
Even more craziness.........the fuel cap says Primus on both sides, but the pressure release key says British on o e side and Burmos the other side. Whats going on ? Is it a Primus or a Burmos ?.
Good news is the bucket test seems to show its holding pressure so will try firing it up at some point.