As he suggested, if he's helped you in the past then it might be an idea to acknowledge it by means of a donation:
Ladies and Gentleman.
It's that time of year again, the Distinguished Gentleman's Ride.
I'll be taking part in the London ride on the 30th September.
Once again i'll be rattling the tin for donations to these fine charities.
If i've ever helped in advice in technical matters and you've promised to buy me a pint when we meet than donate a pint, if i've pissed you off then donate a pint and i'll try not to do it again
My DGR donation page.
Once again, thank you, and look forward to seeing you on a ride
And it's not just all Gentlemen.