I believe you may have the Irvine film confused with the mysterious film mentioned by Ted Holiday in"The Great Orm of Loch Ness".He wrote of a film described to him by an undisclosed witness.It supposedly was a clear shot of the upper body,neck,and head,filmed by secretive Scotsman in the early 30's.The unknown cameraman had supposedly deposited the film in a bank vault,not to be released until his death.Since he is no doubt probably long dead,I think it's safe to assume the existence of the film is greatly in doubt.