These saloon Leyland PS2's were usually to be found, when introduced, on the 23, Northfield and Cotteridge areas. Their use on the route lasted until 1952 when the 61 and 27 took its place. The 61 was part of the the routes replacing the Bristol Road trams. The 27 was Kings Heath to West Heath and the very low bridge near the Cadbury factory meant it was a single deck route. There were letter suffixes at a later date and they were used for one-man ops. The 26 used them as a short working of the 2B. A new route 35 to Pool Farm commenced in the 1960's, later to be route 4, I believe, which used them until replaced by newer buses. This route was used for newer type tickets experiments. The only information on the 28A - a short working of the 28 - was a loaned bus, in BCT livery, which experimented with Pay As You Enter and the standee' concept. The 28 was usually double decked at it was a cross city route.
When fairly new Midland Red apparently hired some of these PS2's for their private hire work and they could be seen in London, Blackpool and Birmingham-on-Sea. As this was at week-ends, when passenger use was low, it was possible.
The foregoing reflects, as far as I know, on BCT and not the PTE operations.