Yes, sadly Trevor is no longer with us.
He was an excellent rider. Rode for Wembley and Bristol amongst others as well as the teams you mention.
He was the first Provincial League Riders' champion in 1960.
I saw his attempt to retain the title at Harringay in 1961. With one ride each, both Trevor and Reg Reeves were unbeaten on 12 points. In a race I shall never forget, Trevor shot off in to the lead and led by "miles". Then, on the 4th bend of the 4th lap, his chain came off, leaving Reg Reeves a very lucky winner of the championship.
As a New Zealander himself, he was partly responsible for introducing Ronnie Moore and Barry Briggs to this country and to Wimbledon as well as another kiwi, Geoff Mardon, who once finsihed third in the World Championship. Trevor also organised tours of South Africa and helped popularise the sport there.
A great character and a great rider.