BA operates 767-300 in two different configurations. Long haul with first generation flat beds and short haul with higher density economy seats. Its the latter type that ply the LHR-FCO route.

The 763 is typically set out as 7 abreast; CE cabin will be 6 abreast where the centre seat (E) in the middle section of each row collapses allowing the AB, DF, JK seats to expand in width. Seat pitch remains the same however.

Avoid the front bulkhead window pairs if you possibly can - leg room is punitively tight.