Ahhh, not far. In terms of R18 owners meet up, there are none as far as I am aware since all owners are normally scattered over distances.
I normally go for a ride with other non R18 buddies from time to time. Finchingfield, not far from you, usually yields lots of bikers on Sundays, extremely busy over the spring and summer months. I also love the Bikeshed in London on a Sunday morning (11:00am ) for a coffee and pastry or a pint of real ale and a steak on ciabatta. Other than that, sometimes we just go for a cruise and stop over at any known cafes.
If you fancy going for a ride one day, give me a bell and we meet at a mid point and go from there.
So far we have planned a ride to the White Horse Custom Motorcycle Show on April 13th just outside Sudbury in Suffolk and the Bikeshed London Motor Show on May 25th.
For both rides I am meeting other buddies at mid points and continuing to the destination together.