Best Avios + cash combination, HK > LHR, using 241

I’m getting ready to book HK > LHR, one way (have already booked LHR > TYO) for next January. Here are the prices for 2 seats in CW using a 241 voucher:

A) 100,000 Avios + £72 (= £1,072 if valuing Avios @ 1p)
B) 84,000 Avios + £222 (£1,062)
C) 75,000 Avios + £292 (£1,042)

Is C) the obvious choice as it’s the lowest total cost? I have about 250,000 Avios left. Or would some people choose A), perhaps to lessen Avios devaluation (theft?) risk, or just to save cash?

For comparison, TYO > LHR rates are A) £1,550, B) £1,540, C) £1,450 so it should be possible to fly TYO > HKG on Avios + cash AND HKG > LHR for less than or about the same as TYO > LHR. Also, availability is much better out of HK and it’s a night flight, unlike Tokyo.