There's receipts in the folder for work done on the LPG system and for the price the whole system could have been replaced at least 3 times. The venturi on the OMVL mixer is a plastic insert so could have been blown out by one of the big backfires that has split the airbox into 3 pieces but someone has obviously thrown it away not realising what it was or what it was doing in the intake trunking. But it came from London, enough said. While there are cowboys everywhere there seems to be nothing but in London. Having looked through the previous MoTs, it's been tested at the same place for the last 4 years and each time has failed on a number of things that seem unlikely. I suspect they were just failing it, telling the owner it was going to cost X hundred to put it right, he just paid it and they issued a pass.