I'll see what I can find
edit to add:
From what I can see the end of the war when it occurred was a complete surprise as the Handley Page Agreement has a schedule going out to July 1919 with the aim of creating 30 squadrons by that time, with 3 a month being created from 1st September 1918. There are minutes of meetings for Sep & Oct 1918 where costs are being discussed, and then in December everything has changed to how to dispose of the facilities and who owes what to whom. 3rd December meeting specifically refers to Oldham.
Here are some costs -
clicky
As Russell says below, it's Open House