Just noticed when I logged on to my Exec Club account that there is now an option to buy BA Miles, it's on the account detail screen after you have logged on, so sorry cannot post a link.
Prices start at £13 for 1,000 miles up to £255 for 15,000, looks like you can buy up to 15,000 in any calendar year, if I have read the terms right.
A useful way of topping up the account if you are a few miles short of being able to book that exotic trip with the beloved..!
g'luck..
