Correct me if I'm wrong, but I thought the Tranmers only visited PF's apartment on the 29th & the 3rd.
If so, how could they know they go there every night. The visit on the 3rd was well before the McCanns dinner time.
You seem unable/unwilling to draw inferences from text. Eg:
- According to CAT when she visited PF they all sat on the balcony which has space to seat 6.
- According to CAT, PF was in her 80's and arthritic. Those with this condition often have a preference for warmth and the sun as it eases the symptons ie she probably had a preference to sit on the balcony and people watch.
- According to PF she heard MM crying on 1st May for 11/4 hours. The crying stopped when she heard the parents return through the patio doors. The patio doors could not be locked from outside so PF would know a) they left the children unsupervised because of the crying and b) the apartment was unlocked by virtue of the parents returning via the patio doors
- According to PF, during the crying incident, she called her friend Edna Glyn to discuss. Hardly surprising because leaving 3 children under the age of 4 unsupervised in an unlocked apartment is a complete aberration and something you would likely discuss with others to discuss what you might do. In this country it would be considered illegal.
- During the Tranmers visits on 30th and 3rd by all accounts they would have witnessed the McCanns and children underneath. It is highly likely PF discussed the crying incident and the fact they were part of a party, adults dining at TB, children left in apartments etc, etc. If you read Jez Wilkins statement he states GM was an extrovert and liked to hold court. I can quite imagine a situation where he was bellowing out to other members of the party in the neighbouring apartments. The Oldfields were next door to the McCanns, Tanner and O'Brien were next door to the Oldfields (or next door but one) and the Payne's were somewhere above the Oldfields and Tanner/O'Brien. PF no doubt heard and observed what was going on.