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That's not what it says on the gov websiteThat's a governor smoke test, which isn't really needed on an engine with electronic fueling controls.
A modern diesel makes most smoke under acceleration, which is why the MOT regs now call it an acceleration smoke test. Most MOT test stations won't risk an engine failure for carrying out a pointless test governor smoke test, when a simple acceleration test is all that's needed.
MOT inspection manual: cars and passenger vehicles - 8. Nuisance - Guidance - GOV.UK
Noise, exhaust emissions, engine malfunction indicator lamp (MIL) (sometimes called an engine management light or 'EML'), and fluid leak rules and inspection for car and passenger vehicle MOT tests.
www.gov.uk
Hold the engine at full fuel position until a release prompt is given and immediately release the accelerator pedal.