2-4-1 voucher for economy seats. waste?
I'm planning a trip to Tokyo for next October/November and finding business reward seats consistently sold out. I'm weighing the option of using my 2-4-1 voucher for economy instead. Normally, a round-trip for two costs £2500, but with the voucher, it's 20k Avios and £1000, saving me £1500. Would you say it's worth the savings, or should I save the voucher for a better opportunity?