child-friendly meeting points, off the M25

Would appreciate any suggestions.

I have a couple of friends in SW London/Surrey that I really need to catch up with, but getting into (and particularly, across) London these days with the 2 is a mare.  Can anyone suggest any child-friendly meeting points that are easily accessible from the M25, somewhere halfway(ish) between J10 and J22.

Many thanks x

Wisley Gardens which is a few minutes drive on the A3 if you come off the M25 at J12 is good.

You do have to pay for entry to the lovely gardens (about £8 I think) but children up to about 6 years old go free.

HTH

Odds Farm or Beaconscot model village are about 10 mins from junction 16 in Beaconsfield. 

Thanks both - much appreciated

x