Bomar was an Adelaide recording studio and they had a record label of the same name for a few minutes. Tilbrook's claim to fame was as a member of Adelaide's (arguably) most important band The Masters' Apprentices. He'd previously been with obscure groups The Bent Beaks and the Sounds Of Silence who both had a local single or two in the '60s. Tilbrook's Bomar single has always been very collectible. I had several copies through my hands 20 or 30 years ago but haven't seen it since. I'll ask around and see if I can find someone who can at least post a scan.