Roger,
You may already know this….
Patrick and a Swedish amateur astronomer, Ulf Johansson, wrote a letter to Sky & Telescope magazine in May 1966 proposing an amateur IAU (IUAA). The idea gained ground at the IAU meeting in Prague in 1967. Very quickly Patrick organised the IUAA with a few friends, including Leif J. Robinson, Vin Barocas and others. Patrick found 19 coordinators in 17 countries (USA and USSR had 2 coordinators). There were successful meetings at Bologna (1969), Malmo (1972), Hamilton (1975), Dublin (1978) and Brussels (1981). After that interest waned and the IUAA disappeared.
Martin