There is an FT thread on this subject (from 2007) at
http://tinyurl.com/bsgsbjm and a BA page on the emergency exit rules at
http://tinyurl.com/bqrjnk9
You may meet the criteria if you are willing to assist in an emergency, although I believe that there is a risk that you will be moved to a much less attractive seat at check-in or boarding if BA staff decide that you do not meet the criteria.