A guy from NATS dropped in sometime last month to test the system on one of our MD-11's that had the new phase 3 ACARS, but it didn't work. May have progressed since then. Funny thing was he (the NATS guy) didn't have a ID validated for STN so the BAA refused him entry. Instructions were carried out by two airfield ops rangers via mobile phone whilst the NATS bloke sat in the car park! Don't you just love STN security!