The correct procedure is to do a partial re-test but if they notice anything else during the
re-test & it fails,You will need to have a new full mot & they will charge you again as only
1 retest is allowed.
You can if you wish complain to vosa if you think they used excessive force or non approved
mot check item ie a screwdriver to poke a hole in it should be finger or thumb pressure & the
small mot hammer & they can use the alloy handle to scrape away at the corrosion but NOT
knock the hell out it.