I bought my cat (and 2 dogs) over with [b]Animal Airlines [/b]in May this year.
I flew on the same flight (BA) but this is not a necessity.
They are expensive (especially when you see the actual cost BA charges!) but are they not worth it?.
I would recommend[u] Mike [/u]at Animal Airlines- purely for the fact that all 3 animals were all rescues, all prone to stress and they all were fine on arrival.
Would also recommend the purchase of the "DAPS" spray- just an added calmer for the trip!
Hope this helps