https://airspace4all.org/reports/report-on-airspace4all-ga-airfield-ats-ads-b-traffic-display-trial/
Executive summary
Trial Plan
Trial Report
It appears that the objective is to get more people to emit ADS-B by whatever means, but since this is for aircraft carrying mainly uncertified ADS-B OUT, it is doubtful the CAA will ever be able to make carriage mandatory. Uavionix is very involved in the promotion, as one would expect.
One of the trial sites is the infamous Barton 
Zero interest in this one, interestingly
Could it be because too many people have have a “bullsh*t threshold detector”?
Well, I did read the summary and abbreviated report.
Seems like a no-brainer.
Oh wait! Some clever UK CAA staff are working flat out to discourage ADS-B out and Mode S transmission in any crowded/constrained G airspace or near any ATZ…
