The Government Says

The testing of PRVs fitted to LPG road tankers (Authorisation 948)

The testing of PRVs fitted to LPG road tankers (Authorisation 948)
Local copy of authoristion-948-lpg-road-tanker-prvs-in-testing-programme.pdf

https://www.gov.uk/government/publications/the-testing-of-prvs-fitted-to-lpg-road-tankers-authorisation-948

seen at 16:34, 22 May in Search.
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