I remember seeing an interview with the McWhirter twin some years ago and if I remember It started something like this. Beaver had been shooting and afterwards in the pub an argument developed over which was the fastest flyingBritish game bird. Beaver tried to research the subject with no success an d eventually a friend referred him to the McWhirters, who were students at the time with a little side line in researching obscure data for other students. Beaver was so impressed with their work he commissoned them to do a small hand book of obscure records as a promotional offer to be given away with Guinness and it grew from there