Paris Roubaix Sportive?

Yeah - there's a medical certificate to be printed out and signed / stamped.

http://www.parisroubaixchallenge.com/us/medical-certificate.html

For what it's worth, if anyone wants (and would prefer to avoid the suggestion above), I've found a place on Harley street that will do the business for £50. PM me for a link / details.

i guess you can write a fancy document yourself and have it signed by anyone who writes like a doctor. works for me in all cyclosportives. PR isn't even considered as such, they won't ruin your pleasure...