Richard J. wrote:

snip

No, it alternates weekly. This week it's as you describe, next week
they'll land on 27L in the mornings and 27R in the evenings (if they are
still on westerly operations).

Full details of the pattern in every week this year are at
http://www.heathrowairport.com/asset...ation_2006.pdf


I've come to this thread a little late but I must thank you for the
link to that PDF, how interesting. I wouldn't have though BAA would
publish said information but then again there's not a lot of point
trying to keep it a secret when it can be observed so easily.