I've been watching since January for PE for September. They have been £800 and something for most of the year. The one time they went down was February, when they were £660. Unfortunately for us, at the time we didn't know if we were going/when we going (medical stuff with mum going on), so we couldn't take advantage of the good price. We've had to wait until last night, and pay £840 each, but since that's what it's been most of the year, we weren't too annoyed.