Again, 'not an expert on yew trees but I believe them to be one of the slowest growing species.
I bought one for a pub in Worcester about 8 years ago(as a replacement for an ancient one that a contractor had killed) it was 25 years old and was only about 4-5ft tall, I remember thinking that as far as pounds per foot went there must be better value trees. If my memory is correct I think it cost about £500.