JAL used to have good fares via NRT, including buddy fares - I went Business Class SYD-NRT-LHR (this was Business Class service in the First Class cabin for NRT-LHR-NRT) and two PSGRS for the price of one. But you still have to suffer one of the world's nastiest airports - LHR. Why not see if you can enter the UK via EDI - I did that via FCO & FRA, landed at EDI and was through CIQ and in a car to the hotel within 15 minutes of landing - had a day there, and then went by train to LON. I left via LHR which reinforced how easy it was using EDI.
Noting your comments about being new:-
NRT = Tokyo Narita Airport
LHR = London Heathrow
FCO = Rome Fumicino
FRA = Frankfurt-am-Main
EDI = Edinburgh
CIQ = Customs, Immigration and Quarantine
Noting your comments about being new:-
NRT = Tokyo Narita Airport
LHR = London Heathrow
FCO = Rome Fumicino
FRA = Frankfurt-am-Main
EDI = Edinburgh
CIQ = Customs, Immigration and Quarantine