pandh,
As an Elstree flyer, it would be very helpful to meet those nice people on 129.55 (who will still give you a LARS-type service if they can).
Unfortunately you won't meet them on a visit to Luton Tower, the 129.55 people live at the London Terminal Control Centre at West Drayton.
Just for info the approach control for Luton, Stansted, Gatwick and Heathrow is done from the LTCC.
Thames and SVFR are currently still at Heathrow Tower, don't know for how much longer tho'......
WF.