P1 and P2 must have moved to Millknowe at some point, because by the time I started at the 'Big Grammar' the 'Wee Grammar' was housing the Maths department.
I think I can pinpoint roughly when that happened. I was two years behind WC1. When I went to the Wee Grammar in 1956 there was only Primary 1 there. It was Miss MacConnachie's class, in the first room at the right hand end of the building. Primary 2 (Miss McBrayne's class) had moved to the Millknowe. Assuming WC1 went to P1 in 1954, P2 in 1955, then P2 must have moved to Millknowe in 1956 (I hope that WC1 is not upset that I have given away his age). I think that Miss MacConnachie retired shortly afterwards, this was probably when P1 moved to Millknowe (probably 1957 or 1958).
For those of you old enough to remember Miss MacConnachie, I think she was a sister of the MacConnachie that had the bus company in Campbeltown, and the owners of the Argyll Hotel. She started her teaching career in Auchencorvie school, where she taught my father (he was there from 1915 to 1924). She was a lovely old lady. I bumped into her in the street in 1967, she remembered me, and asked how I did in my 'O' levels.
WC1's recollections about walking from the Meadows scheme to Millknowe and back twice a day are a bit different from mine. I remember that there was always a couple of busses outside the school at midday. It was amazing how many children that they packed into the busses. Once the bus I was on was stopped by the police and we were counted. The police would not let the bus move until another one arrived to take the excess. We were all late home that dinner-time. I also used to cycle back and forward to the school.
All a bit different from today where school gates around the UK are congested with mothers on the "school run". To us the school run was when you had to run to school if you were a bit late.