Sean (and everyone else)
Unless I've got it wrong, what you've described above will take peops in the opposite direction from the woods for this shoot.
About three weeks ago, Andy sent me a map of this 'new' wood location which shows it to be on the right hand side (south west), and very close to, the B2150 itself, and just (less then 100yds) after the left turn you've described leading up to the MVAC indoor venue.
According to my copy of Autoroute, it's on the B2150, 1.91 miles from the left turn off the A32.
If (like me) approaching from the other direction (leaving A3M at junction 3), via Waterlooville, Denmead and Hambledon, it's just over 7 miles from the motorway, and on the left side of the road.
Andy failed to mention any local (very local) landmarks.
See you all at the end of the MVAC orienteering event
Biggles