No one will tell you even if they know. But a good rule of thumb is to look for local country parks , forests with car parks and secluded lay bys.
Pull up in one if those after dusk , give the appropriate signals and you wont be wanting for company.
"Looking for a good places near wimbledon "
I dont know about any locations but I'd happily brings my works minibus with the seats out for a nice secluded session with you both