They seem to have organised various Home Guard style units along the South Coast based around the local landowners and their workers. We're not too far from Swanage and I've found buttons on the farm from units such as "The South Hants Cavalry", The "Avon Yeomanry" and "The Ringwood Volunteers" . I think they were encouraged by an Act of Parliament around 1793 (From memory) and were disbanded after Waterloo, although some were remustered at the time of the rick-burnings in 1830. Fred
The Buckinghamshire Posse Comitatus was a survey of the (mostly) men in the county in 1798 in case a militia needed to be formed to counter a French invasion. It excludes boys under 15, men over 60 and women, unless they were the owners of draught horses, waggons and carts, or were millers.