Just caught up with this.
@Pingu in answer to your question about paperwork no we don't have the customer sign anything but do make them aware of the different legality of what the failed items are and the difference between a ' major ' and a ' dangerous ' defect.
( a dangerous defect says on paperwork ' do not drive until repaired ' )
(a major defect says ' repair immediately ' )
( a minor defect ( a pass) says ' repair as soon as possible ')
( an advisory says ' monitor and repair if required ' )
But at the end of the day I have no power to hold a vehicle no matter how bad it failed
As for the camera thing not sure but the second you print a pass or fail goes through all the police dvla insurance databases straight away ( I have had customers in reception taxing their car while I am doing an invoice on an mot I literally printed seconds beforehand) the public database is 3-5 days .
If a fail is issued and it's checked by an official body ( e.g. police) the fail will show over the existing pass ( as it was the last carried out )
If still valid mot and you get caught driving outwith the allowed criteria after a fail issued the offence isn't driving without an mot it is driving an unroadworthy vehicle ( as it has failed the basic roadworthy test which is the mot )