Gonzo et al,
I was told (by a reliable source) that we at Heathrow get trained on PDCS in the level 5 SIM run. Level 5 involves four different seats, one of which is GMP. So we all get circa 45 minutes of GMP, with a mixture of PDCS and "old fashioned" clearance delivery - in November! So the next time you do it will be with real aeroplanes after 'O' date. I am not convinced I will remember what to do two months later, so the (re)learning curve will be quite steep.
"Revert to voice"
SM