All the LHR A340-600's and B747-400's have V:Port (except the 747-400 operating to BGI at the moment which is from the LGW fleet), but non of the A340-300's and non of the LGW based a/c do.
The A340-300's at LHR and the ex-LHR 747-400's that are now in the LGW fleet, G-VAST, G-VXLG and G-VTOP have the second best system, Odyssey which was the forerunner to the V:Port system and has much the same functions except it isn't AVOD and a slightly less choice of entertainment, but is has games too.
The 5 Alitalia built 747-400's in the LGW fleet, G-VGAL, G-VLIP, G-VROM, G-VROS and G-VROY all have the Super Nova system, which is the worst system VS have, it has movies, tv shows and music but no games and is not AVOD.
Hope that helps.
