If they can't confirm the engine number then they simply emissions test the engine to current standards. Mark E with the Zenith replica had something similar where the engine number didn't match the donor V5 that the engine came from.
Because Peter hasn't got a Donor V5 to prove the age of the engine this is the same standard as he would be tested to anyway.
The limits on this are lambda 0.97 to 1.03, hydrocarbons upto 200ppm and CO2 up to 0.2%
With the rebuilt engine and catalysed exhaust these should not be a problem. The only difference even if the pre 2001 V5 was present would be that the CO2 limit would be 0.3%
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