It's in the UK AIP (which of course is now invisible!!).
I've got an old chart in my desk at work (not for navigation purposes) which gives the MATZ (!!) / LARS / VDF / ATC frequency as 126.35 - it may have changed since.
Also in Pooleys and AFE guides + I've got it in my Aerad at home. (sorry about all the commercial names, BRL!!
)