Far East routing

Hi all,
We're planning to head out to SIN for a wedding next year but we'd also like to visit Japan. I was thinking of doing a routing like LHR-NRT-SIN-LHR. Does anyone have tips as to how best to achieve a booking on this itinery?
The VS website will quote LHR-NRT, SIN-LHR as a return trip, but the missing NRT-SIN leg is very expensive when booked oneway elsewhere.
I'd also consider package holidays since we'll need accomodation if anyone knows of a twin-centre holiday like this.
Thanks!!!
We're planning to head out to SIN for a wedding next year but we'd also like to visit Japan. I was thinking of doing a routing like LHR-NRT-SIN-LHR. Does anyone have tips as to how best to achieve a booking on this itinery?
The VS website will quote LHR-NRT, SIN-LHR as a return trip, but the missing NRT-SIN leg is very expensive when booked oneway elsewhere.
I'd also consider package holidays since we'll need accomodation if anyone knows of a twin-centre holiday like this.
Thanks!!!