REGULAR bus passengers in Huntingdon are set for cheaper rides following Stagecoach's takeover of Huntingdon and District Buses on Monday. The Perth-based company plans to introduce a flat-rate daily fare of £5 or £20 per week from April 6. But the takeover could still be referred to the Office of Fair Trading, which ordered Stagecoach to sell the Huntingdon operation in 1996 when it merged with Cambus to avoid reference to the then Monopolies and Mergers Commission. Rival operator Whippet could ask the OFT to investigate whether the re-merger could be anti-competitive. For the moment Stagecoach Cambridgeshire's managing director Andy Campbell is promising not just flat-rate fares but new buses and additional training for drivers in disability awareness, safe and secure driving and customer service.