I recall there being a popular database people here used to check the amount of seat sales, I can't recall the name, could someone assist?

I'm flying on BA93 on December 30th and at the time of booking I went for WT but I'm thoroughly regretting it now. I'm trying to gauge whether I should reserve a seat all the way in the back in the hopes of getting an entire row to myself or stick to something upfront.

Help would be appreciated, thank you.