In my recollection, Dunsfold never had a 430. They had a Cossor 787 10cm radar up to about early '90s( superb clear picture compared with the AR1; really sharp small blips but no MTI) , initially in the middle of the airfield then on top of the tower VCR when the new one was built. When the RAF re-equipped with Watchman, the Brize AR15 was purchased, but there was some controversy about that as apparently (so I was informed at the time) there were parts missing when it arrived at Dunsfold which had definitely been in the packing cases when it had left Brize.
Farnborough had an AR1 plus an S232 with an SLA1 PAR. The prototype AR15 called an AR1b was trialled for about 6 months in early 1975, but proved unsuitable for the Farnborough radar tower; it was so high above ground that ground reflections bounced up and tended to cancel high cover! New consoles in about '81 brought SSR feeds from either Heathrow or Pease Pottage(had to be switched by tels rather than on the console).The PAR was replaced by the CR62 when the AR1/S232 were replaced by a single Watchman mounted on the aforementioned tower backed up by the same two SSR sources which were switchable from the console. This was replaced in late '02 by the present Raytheon ASR10 primary radar.