Brian
Some more information for you. This is from Lloyd who I believe is involved with the Wythall Transport Museum.
Phil.
The AEC Q AHX 63 (actually the first double deck one, registered by the makers and originally a demonstration vehicle) after initial sorties on the 16, ran mostly from Acocks Green garage on the 1a route until returning to AEC and being fitted with a diesel engine, after which it ran from Harborne garage (which was the first to have diesel fuel facilities) on the 4 route to Harborne and Queens Park.
In 1940 it was withdrawn and along with a few older buses sold "on instruction of the Ministry of Supply" to Messrs Yeomans of Canon Pyon, Hereford, a small operator who had need of double deckers to ferry construction workers to various RAF sites currently under construction. They also collected AEC Qs from other sources, (it was always a rare model, other than London Transport only ones and twos going to operators) and sadly this Birmingham one ended its days as a storeshed in Yeomans' yard, having donated its engine to another Q type.
The AEC Q was designed by G J(John) Rackham, AEC's chief designer who after an early career in London went to help start up the American 'Yellow Coach' company, under the control of John D Hertz's 'Yellow Cab' taxi building business (Yes the same Hertz as the van rentals firm!) then returned to the UK and straight into the top job at Leyland Motors, where his 'Titan' and 'Tiger' bus chassis designs rendered everybody else's designs obsolete overnight. He moved to AEC in 1928 and designed their 'Regent' and 'Regal' bus chassis along similar lines to the Leyland 'Titan' and 'Tiger' but his American influenced Q type did not meet with buyers approval, sadly.