Check out Superb Trimming Service on Facebook
I was looking to do this in reverse having a red panel added to my comfort seat but in the end I've kept the comfort seat as is and cut down the original seat, STS re-sculptured and added foam then made a new black cover with red piping and stitching for £80 with a 12 month guarantee. You can see it on his Facebook page. I cannot post any photos at the moment but hope to do so in the near future.
Geoffcwilson, your FT looks fantastic, Im loving' the Dark look.