I guess you could try these people:
As far as I am aware there is no organised minibus tour from Salisbury to these places but you can get to most of them by ordinary public transport:
Wilton House - bus R3 goes past it every 20 minutes - see www.salisburyreds.co.uk/timetable_red3.shtml
To visit Stourhead requires taking a train to Gillingham in dorset, then a taxi or the "connect2 Wiltshire" Taxibus which you have to book in advance - see wiltshire.gov.uk/connect2wilts-mere-and-dist… and scroll down to page 5.
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