This was a trial in 2015 for aircraft north of 56N
This was a trial that ran for a few months, six years ago, north of 56N.
As an additional step, a trial has been initiated in Scotland, in conjunction with the CAA, of a VHF Low-Level Common frequency so that civilian operators, limited to VHF comms, can benefit too. The CAA was originally approached by a civilian commercial operator to expand the SAFETYCOM
frequency 135.475 MHz as a more general SA-enhancement tool in Scotland. SAFETYCOM is intended for use as a common VHF frequency by pilots arriving and departing aerodromes having no notified ground radio frequency - details can be found in AIC Y 014/2010. This coincided with an RAF aspiration to develop a UK-wide VHF common frequency as a Low-Level MAC mitigation measure. The CAA have agreed with the Safety Centre to trial SAFETYCOM in Scotland and we have asked them to amend AIC Y 014/2010 to reflect this trial; they are doing so, but have agreed not to delay the trial until the AIC is amended. This initiative has also been supported by GASCO and UKAB. It is widely understood that success of this trial in Scotland does
not imply similar success elsewhere, where the use of SAFETYCOM for its original intention may be more prolific and therefore unsuitable for the wider ‘LL-Common’ role. The trial will run until 1 October 2015
Have you just carried on with that on your own?