Middle Wallop
Having been on a base visit of Middle Wallop last year and another visit approaching in March, Middle Wallop is not the best place to read numbers off. You can go into the museum carpark and read off what ever is flying apart from the apaches! Also there is a small hill as you look at the Gazelle & Lynx pan from the car park, you wont read off any lynx's or gazelles off unless flying. If you take the road around the back, you can park up and normally read off 3-4 Gazelles & Lynx's. Also if you turn right out of the museum carpark, look to your right as your going past the hangers and you will see 1 or 2 Lynx Cabs aswell as a Gazelle cab. This is known as the Stockwell Hall. Serials can be tied up as i have them but nether the less you should be fine at Wallop.
Also i have spotted at Lyneham & Benson but i dont know the area well enough to tell you where the best place to spot from is, sorryy
Hope that helps anyways with Middle Wallop
Regards
James