My favourite 'white knuckle' ride from the past was from Stevenage to Biggleswade on a Charles Cook Metropolitan, I guess in the late 80s or early 90s. I don't believe the route had a number but was quite long standing and, as I recall, always run with double deckers. I think it was a Saturday lunchtime departure from Stevenage with a good load and the driver floored it the whole way. Always loved Metropolitans from commuting on them on the 63 from Kings Cross to the city in their early days at London Transport and later in Reading town centre alive with the roar of the Scania engine and the squeal of the brakes. Very powerful buses with a good turn of speed but the suspension was on the soft side and they did wallow a bit going quickly, certainly on the Charles Cook run they did. There has never been a bus with as much character - shame they rusted away too quickly!