Hi Simon,
The booklet sold out some time ago but is available for download here -
http://www.vintage-radio.info/docs/ - or from the Hacker group files. As Geoffrey Dixon-Nuttall readily admitted his interest in the Hacker brothers' work focussed largely on the pre-1960 Dynatron era, and within that chiefly on pre-war models: the Hacker list in the booklet is indeed incomplete and contains several errors. Mine has received quite a few amendments as more models have come to my notice through eBay etc., but I think as far as radio receivers go they're all or nearly all included and accounted for now.
Paul