GROUND BASED JAMMERS WILL BE LOCATED WI 3KM OF 5201N
00336W (SENNYBRIDGE DANGER AREA).
The middle of south wales, so
JAMMER A: OMNI DIRECTIONAL AFFECTING ACFT WI RAD 68NM (DEPENDING ON ALTITUDE)
...most of South Wales...
JAMMER B: DIRECTIONAL AFFECTING ACFT AT A DISTANCE OF UP TO 210NM IN THE SECTOR 180 THROUGH TO 240 DEG (DEPENDING ON ALTITUDE).
...and some parts of Devon and Cornwall. I think (edit: i haven't got my map handy either).
