Assume you are referring to #112. It is still showing as "For Sale" on Car and Classic, so presumably waiting for the sale to actually complete (or not) before deciding to take it down. Also showing "For Sale" on William Thompson's own site too. Have you actually spoken to them?
Still a small chance for you, maybe. The car was shown as "Deposit taken" a few weeks back, only to be shown a week later as "Available" again.
You never know,
There were actually 14 Typhoon ZT 260 saloons made, all RHD but one, #118 KC53 FXA, went off the radar years ago. Not taxed since 2004 and not MOT'd since 2006 (no SORN). Last ownership change registered in 2007 but not shown as either 'exported' or 'scrapped' by DVLA. In all probability one of those two.
David