There's a certain amount of duff gen being spread here. To pass an IRT in the UK you must fly at least one procedural approach, including a hold, using only single needle tracking. As Cranfield aren't blessed with radar, all IFR approaches there are procedural. Although Cranfield have a VOR approach as well as the NDB, it's not used much as it gets in the way of the procedural SIDs you've got to fly to get into the airways structure. UK IREs aren't going to pass anyone who can't fly procedurally and Cabair students do pass their IRTs.