Well, have now used the new terminal for both Arrivals and Departures. Mostly impressed but slightly sad that my earlier comment of "peas rattling round in a drum" turned out to be true - terminal is clearly way too big for the traffic. Departures is a vast improvement on the old terminal and being able to walk out to plane is a boon - the rather cramped and sometimes chaotic bussing arrangements are consigned to history.
Still seemed to be delays bringing bags in from inbound flight which was all of 150 metres away and, in departures, 9 people manning 1 security lane was a bit strange, including some very careful checking of passports and boarding cards, although I suspect the huge amount of non-EU merchant seaman who are only transiting via LHR may make this necessary. Notwithstanding, the security staff were extremely courteous to all and are a credit.
Calpe Lounge very nice too with a wider selection of drinks and snacks than the old Peninsular Lounge.
Overall, I was impressed - it just needs more flights and pax!