FYI the Boscombe CMATZ is normally only open during the week. When it's active you approach via the Alderbury VRP (unless you sweet-talk BD); when it's inactive (most evenings and weekends) overhead or downwind joins are the default.
Other relevant bits and pieces:
The Porton Down danger area is permanently active. The Salisbury Plain areas can usually be crossed at the weekend at 3001ft (but check activity by listening to the tape on 122.75 and check NOTAMS). The BD ATZ is permanently active.
HFD