When I spoke to BA Atlanta at 7pm to say that I had just arrived at the Avis rental place, they told me that they were all going home in 15 minutes so don't bother to come there. That's when they suggested that I phone London at 2am local time!
I must re-iterate that I wasn't looking for a freebie (and told them that) but was looking for options that wasn't going to cost around £13,000