This isn't related to an ICAO change (though the UK Government plans to pursue this with them), as I understand it, this is down to the UK DfT
Really? CAP 1430 quotes the "source" as ICAO, Eurocontrol and CAA, though I cannot find any ICAO reference to it. However, it does sound like the pathetic, irrelevant nonsense that the CAA would come up with.
2 s