Google Translate made a lousy job of that PDF, but thanks for the link, Pekka. As I read it they're suggesting that because troop numbers had to be built up quickly, they couldn't get transport from Finland quickly enough so borrowed vehicles from the British.
The dates of the Finnish peacekeeping mission in Cyprus, 1964 to 1977, might tie in well with the K9 being sold in 1978 - i.e. they brought it back and then disposed of it fairly quickly.
If as Wally says it was a radio repair vehicle the body John Morter's got would be correct for it, BUT that body is in very poor condition even just from the photos.
Those fuel consumption figures are really poor, I'd expect double that from my K9s and RL!
Is it DBG on the bottom (original factory), then matt light stone (desert tan), then white, then matt NATO green on top? That might be consistent with going to the middle east, then UN service. Be interesting to uncover those markings.
Wally, thanks for the comments. That does look as though there's MBG on the rocker cover at the back, with maybe DBG over (or discoloured / oily MBG). Interesting about the vehicles on that contract.