Location - a14, near a1m junction 14. A1M travelling south - exit at junction 14, A14 to Cambridge. Take next slip road signposted to RAF Alconbury. Turn left at roundabout. Go past Admiral Conservatories on your left and turn left at the next roundabout, this will take you over the A14. Turn left at the next roundabout and at end of the road turn right, you will be coming back up the slip road towards the roundabout. Turn left at the NT Services sign and immediate left again into the carpark. A1 travelling north - do not turn off at Brampton roundabout (A14 Kettering/Huntingdon). Carry on up the A1, past Huntingdon Life Sciences on your left, take the next sliproad (B1043) and follow signs to RAF Alconbury. When you get to the 4th roundabout, turn right. Turn right at the end of the road, you will be coming back up the slip road towards the roundabout. Turn left at the NT Services sign and immediate left again into the carpark. A14 travelling west - do not turn off at junction 23. Keep on the A14 and turn off at the next sliproad, the B1043. Take the 2nd exit on the left by the NT services sign, then immediate left into the carpark.