For both locations the club secretary will send out more details directions and briefing notes on the Thursday evening before the shoot that weekend.
Basildon Rifle & Pistol Club: Gardiners Cl, Basildon SS14 3AN. It is towards the end, on the left. The club does have a pin on Google Maps.
Cambridge gun club: Postcode CB24 8AH
You should approach from the west, try putting "Cambridge Gun Club" into your mapping app.
http://www.cambridgegunclub.co.uk/directions/
The entrance to the Practical range now has a gate, please close after you pass through:
Romsey: On Google maps, search for Test Valley Clay Pigeon Club - postcode SO21 3BE gets you close although you need the north side of the road.
St Albans: This is actually closer to London Colney, postcode AL2 1BT will get you close, full details in the briefing.