Whilst I favour SkyEcho with ADS-B as it is the approved protocol operating on an approved frequency, I note that PAW is hard over on its argument that they will not support ADS-B out on the premise that the frequency does not have the capacity to handle the volume of ADS-B traffic that would result from all potential users utilising it. I have no idea to what extent that is true, but PAW pressing ahead with an unprotected frequency and bespoke protocol, looks like wishful thinking - however much I respect their efforts to achieve a UK EC solution.