In 1911 the Salisbury District Joint Isolation Hospital was erected, where the Sarum Centre now stands. It closed in 1951. In the burial register in February 1915 is recorded the first deaths from that hospital and during that year, in March, the death of the first soldier from there is recorded - the first of a number during the year. Most of these men were from Australia and New Zealand and most of the burials took place in a particularly wet season "when the springs were up" thus, as the entry in the register tells us, they were buried in the north-west corner of the churchyard, which was rather higher than the rest of the ground.
There's very little information online about this site. What I do know is that I drove past today and it's been demolished...
According to the planning permission application for demolition dated June 2012, it's going to be used for housing by Persimmon Homes. Didn't even know the Sarum Centre had closed. Similarly to the Old Manor main hall, keep your eyes open or we'll miss more.