Now here's another challenge along the lines of that about callsigns.
When I first became interested in Luton in 1968 IIRC the frequencies were as follows;
APP 129.55 ( no change there - if it does change I think it's time for the Ravens to leave the Tower ( London not Luton). But when was this introduced and what were frequencies before my time
RAD 127.3 123.55 (latter rarely used).
TWR 120.2.
Around 1970 we lost 123.55 and gained 128.75 which IIRC was the initial GND frequency. Or was 123.55 used briefly before that for GND.
Then we settled to GND 121.75 TWR 120.2, RAD 127.3, APP/DIR 128.75 APP 129.55 I think- 127.3 was used for SRAs until quite late on.
At some stage the original Radar was replaced by the one on the south side of the runway - Plessey units I think - was the first one a 424- whatever it was it responsible for horrible whine on 127.3.
The TWR became 119.925 (not sure about that)
Then we settled to what we have today, with TWR becoming 132.55 and 127.3 being lost. At some stage 126.725 was introduced as a back up TWR frequency.
I think we still have or did have a delivery frequency - but has this ever been used.
Vintage ATCO will be able to shed some light on this- corrections and dates would be useful