Inside Marks and Spencer (Sunday, 8 p.m., Channel 4) examines the British retailing institution's remarkable history, from its 19th century origins as a penny bazaar to its current troubles on the High Street.

As offshore fish stocks come under greater pressure, fishfarming is expected to expand. Out of the Blue (Wednesday, 7.30 p.m, RTE 1) visits a salmon farm in Killary Harbour.

The 185-year-old Pringle company, which employed more than 2,000 people at its height, now has a staff of 200 and is losing money. Trouble at the Top (Thursday, 9.50 p.m., BBC 2) asks whether its new chief executive, Kim Winser, can enhance its image and its cashflow.