Not sure I understand what ba.com is showing me at all.

Lon--->NYC return flights in July. Identical flights/dates, prices are as follows:

WT+ Cash £1094

Biz Cash £1694.17

WT+ UuA to Biz: £1677.17 + 40k avios.

I though UuA was exactly that...you used your Avios to pay for the next cabin...not a whole load more cash and you Avios, to the extent where it would be just £16 more to pay for the flight in cash (and make that back in TPs and Avios for cash biz flights).

Can anyone shed any light?

For info:

8/Jul/17 BA175
15/Jul/17 BA172

Thanks.