They're selling lots of seats still, but that doesn't mean they'll open up for Avios redemption.

The 772 4 class is small comparatively in peak season with only 120 odd Y seats. VS put a 744 with 375 Y - There are 2 BA services to BGI on Sat/Sun.

More than likely overbook and roll up the cabins. Do you have a MMB POUG offer? Sometimes that's an indication of how full they are.