The way I see it is as follows, The important words in the above are "subject to"
All petrol vehicles (after 92) are "subject to" a full cat test should they fail a BET test.
No diesel is subject to a "full cat test"
Therefore the "presence test" is only for petrol vehicles.
I'm quite happy to be corrected and learn along the way.
Mark
Modern cars, Its all wizardry and witchcraft
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