There was only 37 ST200's actually.

Here's the list I borrowed of VVOC (Vauxhall vectra owners Club) of the ones they know of at the minute:

build: car: colour: model: year: owner

0000 ST200 White Saloon 1997 Gary MacFarlane (VXLSCC)
0002 ST200 White Saloon 1997 Richard Egan (MIGWEB)
0004 ST200 White Saloon 1997 somewhere in germany
0005 ST200 White Saloon 1997 Harvey Emsley (VXLSCC)
0008 ST200 White Saloon 1997 Peter Smith (VXLSCC)
0010 ST200 White ***** WRITTEN OFF *****
0011 ST200 White Saloon 1997 Craigst200
0014 ST200 White Saloon 1997 Mark Burchill (VXLSCC)
0015 ST200 Black Saloon 1997 ST200 Richard Garbas (VXLSCC)
0017 ST200 Black Saloon 1997 Vicky
0019 ST200 Black Saloon 1997 Gareth Stevenson (VXLSCC)
0024 ST200 Black Saloon 1997 V6 MSD (VVOC)
0025 ST200 Black Saloon 1997 Berley George (VXLSCC)
0027 ST200 Blue Estate 1997 Nick B (VVOC)
0031 ST200 White Saloon 1997 Alan Pratt (VXLSCC)
0033 ST200 Silver Saloon 1997 Tim Crane (VXLSCC)
0034 ST200 White saloon 1997 Darren Brice (VVOC)
0035 ST200 Silver saloon 1997 FOR SALE
0036 ST200 Black Saloon 1997 Dave Roberts (VXLSC