I have a telephone number for BA RTW: [1] 800-828-7797. Having said that, I've always ticketed on AA, so have never had cause to confirm that it is valid.

Irish lad, do look at the posts that compare costs of RTW tickets on BA versus AA. BA imposes a significant fuel surcharge, and AA does not. You'll find a significant swing in the cost of your ticket depending on whom you chose.