Kidlington used to have a non-standard marker on the 'NDB-DME 100 deg to Aerodrome' (which most of us remember as the NDB 09 approach before they closed 09-27, although we never landed off it anyway). It radiated the Morse letter 'K'. It marked a step-down fix on the approach, at which you should be not below 1250(980).
I see from the latest AIP chart that it's no longer there, and this is now a stepdown fix at 2.8d (so with no DME your minimum becomes 1250(980) but with DME it's 800(530) -that was always the case if you couldn't receive the marker).
Anyone know of any other non-standard markers i.e. not OM, MM or IM on an ILS?
Also this thread has prompted me to notice that at my home base, Benson, the MM has vanished - shows how much attention I'm paying on ILS approaches! Mind you with radar monitoring it was a bit pointless.
Tim