Wow Matgill - you are going to get some splendid polytunnel with £2,000!
Are you going for a gigantic one? Or just very good quality?
I went to First Tunnels and they were very good - although if I had more money (your budget looks impressive) I probably would have gone for a tunnel with a stronger frame and a slightly better/stronger cover.
They were very reasonable, very helpful and their after sales is good!
Old Bird
;D