I'm hoping to use the 2-4-1 voucher for my honeymoon in October in economy (I haven't yet received the voucher but should in the next couple of weeks). However, looking via the regular reward flight portal, there's zero availability on any economy flight in the whole of October or November.

I'm really surprised as there are at least two daily flights from LHR and it's months in advance. If I look at availability for other destinations there's loads. Seems very odd there's such little specifically for Tokyo.

Any ideas or suggestions? I don't know if there's additional availability that opens up once you get the voucher (I assume not but worth a shot!).