How to hint in a CLEAR but subtle way that I WON’T design for free?

Hi all,
I have a consultation coming up with a potential 'client' who is also a past colleague.
I'd previously made the decision I wouldn't offer design services to friends, family or acquaintances as they normally expect it as a 'favour' and expect me to work on it frequently. Its very hard to be firm with them the way I am with outside clients!
Anyway, we've just arranged a consultation but I have a feeling they are hoping I do the work for free which I would find rather disrespectful and…
How to hint in a CLEAR but subtle way that I WON'T design for free?

See original post by trucom