By Amber Murray The travel food specialist behind Upper Crust SSP Group has reported a boost in revenue, with UK sales supported by demand for air travel and easing rail disruptions. Revenue grew by 17 per cent for the year to 30 September, with full-year operating profit expected to be £210 to £220m, up around 30 per cent year on year. SSP’s operating margin was six per cent, up by 0.5 per cent on a constant currency basis year on year. SSP, which operates franchises of well-known cafes andsandwich shops like Upper Crust, Starbucks and M&S in transport hubs across the world, said that sales g…