Hello Mr Greg ,Yes Laurie's son made hang glider sails through the mid 70's and early 80's and Brian Shilland made the yacht gear until Laurie retired .I'll have to ask Brian for the full story ?
Cheers Bear
PS
L R Mitchells made a lot of gear in the 60's and 70's He made the sails for Swanson's ,Camille which in 1964 came second in the Sydney to Hobart ,and got selected to represent Australia in the Admirals Cup .Mitchells was the one of the biggest sail lofts back then .
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