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The way it's done is hydraulically, we used a thing called a bucket pump and a calibrated gauge. I don't imagine you have those to hand. I would ask a local garage who does their insurance inspections, your looking for a tame inspector who might test your valve when he's doing theirs rather than contacting the insurance company direct who will get all unnecessarily financial about it. My old boss said he would sack anyone who took more than the price of a cup of coffee for a side job but we might have done a few free on the side in the name of general safety