Thanks Rod, nice offer.
For now the idea is to camp at Brixton, as Hensmen suggested. That way further inside the M25 as i originally wanted, but i can leave the bike at the campsite for the whole day. Saving me to drive wearing all the gear to a parking spot and then take public transport.
I'll take your address with me. Oxford is on the visit list, we might come by your shop and have a taste of your coffee. Or i drop the girls somewhere and come to talk sidecar with you.