Can *anyone* help me identify this pneumatic valve?

All,

I’ve reached out to a few people for help but I’ve drawn a blank trying to identify the pneumatic relay control valve for a Horsa glider.

It’s described as a triple control value, has a single connection for the source air (at 80psi) and three actuators which either route the air through the out ports or allow it to vent to atmosphere through the actuator arm body.

I have no idea of dimension but if pressed I would guestimate at the main body being at least 6 inches/15 cm long. It is supposed to be covered by AP2337 and I suspect it may be a Dunlop unit with an AHO designation. The only numbers I have for it are Airpseed part number 655117 and stores ref. 26ED/12882. (26ED being Horsa)

What I need is:

* Air Ministry part number if possible.
* Any technical documentation on the valve i.e description, method of operation and other drawings.
* A source for a non-airworthy example for a static cockpit.
* Failing that, the dimensions of the long side of the valve body so I can manufacture an appropriate mock-up.

Would also be curious about the single control valve unit it replaced P/N 655304, stores ref: 26ED/10052

Any help gratefully received.