British Airways Boeing 747-436 G-BNLN operating BA11 London Heathrow – Singapore (depart London 27th October) had just crossed the Kazakhstan border close to Uralsk when it turned back to London Heathrow due to low oil pressure on one engine. The aircraft was operating its first flight in service following a 10 day maintenance visit to Cardiff-Wales. The flight and today’s return BA12 were subsequently cancelled.