Thanks for that – It was just that I read that the three leg seats were from a DH Dragon and the Anson had four leg seats?

Yes, although there are different types for Anson/Avro XIX (the other sort has four feet and big headrests), the one I have seen have four feet.

There are some pictures in here …

http://forum.keypublishing.com/showthread.php?134511-Avro-Anson-Passenger-Seat-Design