MD, yes it appears to be a tip. If you're interested contact Colin Cuthbert:
[email protected]
I've never actually met him as all my contacts with him were via email and phone, but he was really easy and fair to deal with. They took my C4S in trade sight unseen (you'll see it listed above the 996TT on their website) and I am super happy, .....let's say happy, happy, happy!...with my 997TT!
Cheers!