No Idea about an association, but I once owned one of these boats , the 18ft 6 in "weekender" and sailed it to the Med and back from Weymouth in the spring/summer 1975 > fantanstic strong little boat that took us thro some conditions that I hardly like to think about now!!!... Good sailing Nick
This is taken from the Readers Noticeboard Feb 2002 PBO;
"The Vivacity and Alacrity Owners Association(VIVA) now has 70 membersfrom all around the UK as well asEire,Malta,Jamaica Canada and Australia.We publish a quarterly newsletter and access to a pool of advise and information for members The joining subscription for the UK is only £5 . Telephone John Cook (01908)521 737."
I had an Alacrity a few years ago.Very strong and surprisingly quick for a bilge keel cruising boat.