On the face of it a front engined, forward entrance, full-height decker suitable for either one person or conductor operation sounds ideal for London during the late 70s/early 80s. The ease of building a rear staircase with no engine there for extra brownie points too.
Hopefully someone with further knowledge can enlighten us?
If London were looking at the Ailsa as a Routemaster replacement with a rear entrance and rear staircase, events moved along quickly enough to put the brakes on such a project.
Firstly, the "Fairs Fare" affair with the High Court ruling against the GLC. The immediate aftermath was substantive fare rises and London Transport discovering they had too many buses. Crew operated DMS's and Routemasters were picked for withdrawal to save money.
Then LT and the GLC launched the Travelcard, which was an off-bus ticket that could be purchased from shops and tube stations. The Travelcard was not that revolutionary; WMPTE introduced their Travelcard in 1973 and it was used as a tool to increase one person operated buses (and the Ailsa as far as West Midlands was concerned was an OPO bus). With LT Travelcards selling well the undertaking found that dwell times for OPO routes, even in Central London, reduced. By 1986 London Buses were able to reduce the number of Routemasters needed, which released sufficient RM's to be sold outside London as a nippy tool that could be used in deregulation against operators that did not have their own Travelcard and relied on drivers taking fares and giving change.
Last but not least London Regional Transport getting their feet under the table. London Buses had managed to start an Alternative Vehicle Evaluation before LRT got settled, and the specially designed Ailsa was part of that. However. LRT was tasked with ensuring London buses was more efficient, so took the view that it was up to the operators winning or London Buses Limited subsidiaries winning London contracts to decide what buses to use to meet the contract specification,
not be told
what buses to buy. This is how LBL subsidiary Harrow Buses ended up with second hand Ailsa's from West Midlands and leased MKII Metrobuses, but cheap and nasty LBL BexleyBus used DMS Fleetlines and some of the new contractors like Capifal Citybus were using second hand Metrobuses that had started their careers in Tyne and Wear and South Yorkshire (or Boro'line using buses they could beg or borrow from anywhere).
Aldenham, which carried out London bus overhauls was closed with operators now using facilities elsewhere. Overhauling Routemasters in Rotherham for London and elsewhere proved to be a nice little earner for SYT!!!
The late 80's/early 90's era in London is fascinating.