Thanks for the info - good to know!

In relation to OT2 : I always use the Dolce Vita Lounge you mention at FCO in T1 to check in. It is so easy as you completely bypass all the regular check-in desks and the staff are extremely helpful. It is very quick.

In relation to OT4: The red boarding passes are used for Business and Sky Priority and the Green ones for everything else. Normally the regular Sky Priority desks all have the red ones but sometimes they run out (or at LHR they just can't be bothered to load them in the first place) and print them on the green anyway. It seems in the lounge they only ever use the red ones.