On 17/05/2018 20:49, Grumps wrote:

That's an interesting series of events. Thanks for sharing.
Do they actually take anything apart when doing an MoT, to insert
emission test probes etc?

They don't take anything apart.
However there is a warning displayed that they rev the engine and that
sometimes they break (if they haven't been serviced properly?).
I expect that to be mechanical bits not the sensors though.