I've now made a first pass at tips for the Popham circuit and it also links to the general description on the Popham webpage too. See the second half of my rentals page:
Popham Rentals and Tips
Some people are a little bit dubious about Popham because of the final late turn onto R26, but it's mainly psychological. Just be ready to have a second go if you don't like your first try, but follow the tips and you will find it's not as bad as you imagine.
The unofficial event should be on the Popham airfield events page later this week, and it MAY even make the events page of a certain monthly magazine.