I realise that a handheld unit isn't banned as such and is thus permitted but where is the ICAO bit? All I see is CAA/EASA type approval which is nothing to do with ICAO.
The ANO amendment extends the requirement for Schedule 4 Scale KK (1) or (2) equipment to non public transport flights. Scale KK requires the equipment to operate in accordance with the relevant ICAO provisions. Article 19 requires the equipment to be CAA or EASA approved. 'Survival ELT' as specified in Scale KK (1) is defined by ICAO as 'an ELT which is removable from an aeroplane, stowed so as to facilitate its ready use in an emergency, and manually activated by survivors.'