Assuming that you're UK based and hold an UK citizenship, I wouldn't consider the USA if I were you as other than a speculation by some news agencies, they haven't made any announcement that they would revoke the Presidential Proclamation not allowing people who has been into the UK within the last 14 days.

If you would like to be on the safe side, book something to a country that has clearly indicated that they would open their borders to the UK or which their borders are currently open. Otherwise, you might end up with a FTV with BA and vouchers with other costs such as cars, hotels, etc... if you decide to pay at this time.