Infamous 'airmiss' as it was called back then. Light aircraft instructed to route via Luton overhead, pilot flew overhead the LUT (NDB) and came close to an inbound making a procedural approach onto, as it was back then RW26. This occurred during a rare outage of the AR15 radar. Nomenclature change as a result. Route via the Lima Uniform Tango, or via the Luton airport overhead or defined runway threshold. I digress......