British Toy Auctions of Runcorn have three engines for sale on 5th Feb. No time to add details just now but their website lists them.
Mike
Sorry I never got time to post picture son here but the A3 sold for £400, the Princess £1300 and the Jubilee £400. Big difference between them but presumably two people particularly liked the Princess only.
Mike
For the record here's some of the Princess.
(https://i.ibb.co/jGRN8Pw/2020-Princess-1.jpg) (https://ibb.co/jGRN8Pw)
(https://i.ibb.co/vmDZYVC/2020-Princess-2.jpg) (https://ibb.co/vmDZYVC)
(https://i.ibb.co/xL3J49X/2020-Princess-3.jpg) (https://ibb.co/xL3J49X)