Mystery Allman Sprayer

[charlie]

I have had a request for help to identify this Allman sprayer. It has Villiers Mk12/2 engine which dates from 1960. The brass plate on the sprayer reads Type HP2 ED, Serial number 852 and there is an aluminium tag with the number 473. I am guessing HP2 ED could mean High Pressure Engine Driven. Any information would be appreciated.

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