Luckily, when I got up the rain had stopped and the roads were starting to dry. I loaded the bike and noticed that one of the British registered bikes that had been there the night before was missing. Two guys turned up who turned out to be the owners of the other bikes, and it transpired that their friend had packed up and left without telling them or leaving a note. They assumed he'd had a family emergency and left in the night, but were a bit annoyed that he hadn't told anyone or even texted them.
We spoke for a short while and mentioned that I was heading to the old Reims-Gueux race circuit, just outside the city. They were also heading there, but were going for breakfast first. We said out goodbyes and I headed to the circuit.
Without my sat nav, I'd bought a more detailed map and planned my route, however I missed a turning, ended up on the péage, riding 20 km to the next exit, paying 1.60 Euros, finding a route back, getting lost, checking my map at about every junction, and eventually got the circuit; a journey of over an hour and a half which should have taken 15 mins!
The circuit itself was a road track that had been used for car and motorbike riding up until 1972. The building were left to decay until an organisation started restoring them and I believe there are plans for a museum to be built behind the control building.
History of circuit: here
Friends of the Circuit website (in French): here