miss minnie said:
so what is the real reason then?
i would guess the cost of maintaining such an old fleet. living next to a bus stop on the brixton road, as i do, i have a view that regularly includes a routemaster with a seat propped up behind it to indicate a breakdown.
Dogmatique's answered the qurestion re breakdowns, they were less frequent than people think.
I imagine that if they were breaking down more frequently recently, it would be because the tail end of the 159 fleet looked terribly undermaintained, in preparation for retirement/sell off presumably.
The real reason was to save money, largely by sacking conductors.
The RMs were reaching the end of their natural life true, but I'd doubt to the extent that a full engine and interior refurb wouldn't have sorted them out for a few more years, pending (in an ideal parallel universe) the design of a replacement New RM, analagous to the new taxis. If Transport for London (or the bus companies??) had not been so stingy, they would have commissioned the new version of the RM, the QRM, designed by a team led by Colin Curtis (original Routemaster engineer).
Sadly I can't find any information about the QRM on the web

I've never seen a picture, but apparantly those new QRMs were fully accessible.
When I have time, I'll find my old rant about how, in Travis Elsborough's book, the RMs demise is attributed in part to some Yank tourist lawyer-chasing tosser falling off a bus in Putney and sueing TfL for over £2 million quid .... successfully!
They feared furrther actions.