Just to amplify this a bit.
The APB was derived from the Moulton ATB, which was made at Bradford, but the APB was only made by Pashleys.
The APB was the predecessor of the TSR Moulton.
Just to bring things up-to-date - Pashley Cycles have joined forces with Alex Moulton Bicycles to create The Moulton Bicycle Company. It will manufacture, market and distribute the Moulton and Pashley TSR ranges of bikes.
Miles