Don't know about Boscombe but Llanbedr had a DASR1 when I was a cadet there. Not a huge range as I recall but it had 2 aerials back to back, one high and one low beam. It bust a gearbox whilst I was there and we "borrowed" a gun laying radar from Manorbier, an AA4 Mk7. Sadly my cadet unit endorsement only covered the DASR1, I would have liked documentary evidence that I controlled traffic on an artillery radar.