If they got the time wrong it can only have been a genuine mistake, because they recorded it in their notes which appeared in Matteini's report of 8 November.
So therefore
a. The postal police must have looked at their watch at 12:55 and read 12:35
b. There was a policeman wandering around with his hands above his head around 13:32, boots up to his mid thighs and a pink stripe on his trousers
Did the police officers make contemporaneous records of their arrival? Or perhaps because it was just a routine visit about a lost phone they did not bother? Did they check in with 'base' to say that they had arrived leaving a documented phone call? Or did they just turn up with the intention of knocking on the door? They then got distracted by students panicking about a missing English girl. Did they perhaps get their not books out and make a contemporaneous record at that point? Or did they just have to make a guess as to the time several hours latter when they eventually wrote down the events of the day?
If there were contemporaneous records kept would they have referred to them when giving evidence? Did they?