...been years since I successfully did the ITC...but I guess that running, circuit training and an ability to read a map whilst up to your a**e in snow is still useful! Mebbee do some road pounding, lunch time circuits and do the UEL (or whatever the hell it is called these days).
Oh yeah - and a good sense of humour!
I
think that Level 10.8 is "acceptable" for your RAFFT - and 3 miles in "around" 21 minutes good too.
Good luck.