Actually... now that I think about it (and have just booked my MR)... Velocity says now that it calculates per segment, provided the flights are two separate flight numbers. Meaning... that I should be expecting 280 points for MEL-SIN (60+60), SIN-LHR (80+80), instead of the old method of MEL-LHR (100+100)...
So I just spent money on a same day return flight to ADL for nothing...
I won't tell if you won't!