I think that example is a bit odd
If you aren't qualified by your licence to undertake an ME flight, then trying to take-off is not permitted. The engineer's ticket only covers you for the taxying bit.
Having an incident like this would invalidate insurances and cost you a hell of a lot personally.
In other parts of the ANO I would guess, but won't go looking for it, it will say that you are not permitted to commit aviation unless your insurance, licences and ratings are valid.