Hopefully one of the current Cardiff ATCOs will come along and confirm this as I am out of touch now.
The reason for publishing 126.625 as the contact frequency is that many off airways flights predominately LARS traffic were calling up on the airways frequency.
This was partly down to the way the chart had the frequencies displayed meaning those who hadn't briefed but only looked at the charts assumed they called up 125.85 for a LARS service, this was not only inconvenient but blocked the far busier Airways frequency.
To try to ensure that all traffic not on airways goes to the appropriate frequency they have published in the AIP that 126.625 is the first contact frequency.
Traffic being worked by other units will be given the appropriate frequency for handover this is purely for those calling up off their own volition.
Current Cardiff ATCOs please correct as appropriate no doubt 101 new SIs etc have been published since I left !!
Well Done I'm not Joking Sir really pleased for you
