Although these suppliers don't match your search for Alfresco venues in Dorset, they are within approximately 40 miles and could still be of interest.
Venues, Alfresco venues, Westbury, Wiltshire
Welcome to the White Horse Country Park. The White Horse Country Park is on the outskirts of Westbury alongside the A350. The club house is situated within 247 acres of parkland, which is overlooked by the Westbury White Horse. Within the beautiful setting of the country park, the club house offers excellent facilities for weddings, conferences and functions with catering for up to 250 persons (not seated). We do have a fully licensed bar. (Alfresco venues in Dorset)