Channel 4's Dispatches programme sought to throw up questions over cabin crew training, security checks, tired air stewards and cleanliness.

But last night's broadcast, called Ryanair: Caught Napping, failed to provide anything but the mildest claims against the low-fares airline.

Significantly, the programme carried no comment from Britain or Ireland's aviation authorities, who Ryanair said had found no cause for concern following the allegations.

The most serious allegation centred on what Dispatches said was the lack of final passport and boarding card checks upon leaving the boarding gate.