"""Not really interest what folk have put on web-sites in recent years."""
No, but other readers of the thread maybe interested in seeing them.
""""As for G-ANZT I think we are all thinking/remembering along similar lines. The slight difference might be conversion (& completion) by Rollasons. """
This looks possible, G-INFO shows NZT initially registered to WSF and then to Rollasons, transferred in Mar/Apr 58. Transferred back to WSF in Jun 64.