Just played it through, well done A_Rude_Gesture!
Here's some tips:
You can use 'captured' as opposed to 'allied' when buying units - those units will then show the same country flag. If you use UN OOB and buy units from the Swedish OOB you'll have two unit flags UN and Sweden. If the units were bought as captured all units will have the same unit flag, rank system etc.
I'm not entirely sure but i think that if you don't place all Victory Hexes on the map, the scenario will run all it's turns before it ends even if you wipe out the enemy on turn 20.
Losses:
UN 3
Enemy 230, 2 armoured cars, all the mortars...