On 4th September is a Jap car meet at Bentley Wildfowl & Motor Museum.
Here's official link: http://japbash.com/
And one for Bentley: http://bentley.org.uk/#/welcome/4525140631

I'm also posting this on the DaiClub forum.
If enough people post here I'll email the organiser for our own area.

Here's some photo's of last year I took.
http://s45.photobucket.com/albums/f87/Stew2000/JapBash%202009/
Wasn't any Daihatsu's >.<