ASLEF
Associated Society of Locomotive Engineers (railways – drivers, operational supervisors and staff)
TSSA
Transport Salaried Staffs’ Association – railways, London Underground, travel, haulage, shipping
UNISON
The public service union for all those providing services to the public whether employed in the public, private or voluntary sectors
USDAW
Union of Shop, Distributive and Allied Workers – retail, distributive and related industries