Lots of people use the 241s to fly first class. While BA does not guarantee to first class redemption seats on every flight they do guarantee 2 club world seats. You should book those when they come available and when first class seats open up call in and change your booking to first class.
See these threads:
http://www.flyertalk.com/forum/briti...re-better.html
http://www.flyertalk.com/forum/briti...r-advance.html
http://www.flyertalk.com/forum/briti...g-2-4-1-a.html