If the previous test was a computer test then expiry dates will be logged in system and will automatically show and then be printed out on V20 if less than one month to go,this also is the case with 1st MOT as V5 info (first date of reg)is on system.If previous test was old type then we put in manually expiry date.we have a record of tests carried out which we can access but from memory(as im at home now)no expiry dates.
Hope that makes sense,
Regards