"40% more for the rest of your career?"
On average you are getting 3-4% on basic every year anyway so the mark time would be 10-12 years at the very most. My salary is/will be up 25% in 4 years 2001-2005 so the actual mark time would only be a few years, OK, I am band 5. Even as a band 1 you would be relatively experienced to be considered for CATC so therefore not at the bottom of the 1 scale, so your mark time would, IMHO, be 6 years at most. Justifiable? If you consider 2 house moves, family etc its probably fair.
Think before you (dramatically) post.