Ah right sorry.
In that case your best bet would be an independent show and generally most have "casual" classes which would be perfect.

Depends how far you can travel as there aren't often many shows that I know of in London itself.
UKA shows tend to be pretty good for baby dogs and casual classes.

For instance there is a UKA show in Cheltenham on the 5th of December 2009. Closing date 6th November
It has both Casual and Nursery Classes- both jumping and tunnels only
Measuring on the day
It's on the show diary on agilitynet if you want more details.

I think Cheltenham's not that far from London- 1.5 hrs or 2 hours maybe if my geography is any good?

Hope that helps

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