Thanks. So the only requirement is that the jaw is shorter than at least 'one' of the legs flown. So I'm guessing for eg. HKG > LON would be ok as it is 'slightly longer than the jaw (AUH > HKG).
I'll seriously consider this now. Will need it look into some Asian (I guess anywhere West of the UK is ruled out) destinations availability and consider one way options ex-UK.