The formations were posted on a gen group again yesterday morning, so here is the latest update
CS01 14-Oct 15004-15101-15201-15308-15307-15303-15304-15206
>>>> 26-Oct 15004-15101-15201-15308-15307-15303-15304-15206
>>>> 23-Nov 15004-15101-15201-15308-15307-15303-15304-15206
>>>> 7-Dec 15004-15101-15201-15308-15307-15303-15304-15206
>>>> 18-Jan 15002-15101-15201-15308-15307-15303-15304-15206
CS02 14-Oct 15005-15103-15202-15311-15312-15313-15322-15306
>>>> 26-Oct 15005-15103-15202-15311-15312-15313-15322-15306
>>>> 23-Nov 15005-15103-15202-15311-15312-15313-15322-15306
>>>> 7-Dec 15005-15103-15202-15311-15312-15313-15306-15214
>>>> 18-Jan 15005-15103-15202-15311-15312-15313-15306-15330
CS03 14-Oct 15008-15106-15203-15316-15324-15325-15329-15209
>>>> 26-Oct 15008-15106-15203-15316-15324-15325-15329-15209
>>>> 23-Nov 15008-15106-15203-15316-15324-15325-15329-15209
>>>> 7-Dec 15008-15106-15203-15316-15324-15325-15329-15209
>>>> 18-Jan 15008-15102-15203-15316-15324-15325-15329-15209
CS04 14-Oct 15007-15105-15205-15314-15333-15332-15331-15330
>>>> 26-Oct 15007-15105-15205-15314-15332-15331-15330-15333
>>>> 23-Nov 15006-15105-15205-15314-15332-15331-15330-15333
>>>> 7-Dec 15011-15105-15205-15314-15332-15331-15330-15333
>>>> 18-Jan 15011-15105-15205-15314-15332-15331-15322-15333
CS05 14-Oct 15009-15108-15204-15318-15328-15320-15319-15309
>>>> 26-Oct 15009-15108-15204-15318-15328-15320-15319-15309
>>>> 23-Nov 15009-15108-15204-15318-15328-15320-15319-15309
>>>> 7-Dec 15007-15108-15204-15318-15328-15320-15319-15309
>>>> 18-Jan 15007-15108-15204-15318-15328-15320-15319-15309
CS06 14-Oct 15003-15109-15207-15323-15321-15317-15310-15208
>>>> 26-Oct 15003-15109-15207-15323-15321-15317-15310-15208
>>>> 23-Nov 15003-15109-15207-15323-15321-15317-15310-15208
>>>> 7-Dec 15003-15109-15207-15323-15321-15317-15310-15213
>>>> 18-Jan 15003-15109-15207-15323-15321-15317-15310-15213
CS07 14-Oct 15010-15107-15210-15334-15305-15327-15335-15315
>>>> 26-Oct 15010-15107-15210-15334-15305-15327-15335-15315
>>>> 23-Nov 15010-15107-15210-15334-15305-15327-15335-15315
>>>> 7-Dec 15010-15107-15210-15334-15305-15327-15335-15315
>>>> 18-Jan 15010-15107-15214-15334-15327-15335-15315-15305
CS08 14-Oct 15011-15102-15212-15339-15338-15340-15326-15211
>>>> 26-Oct 15011-15102-15212-15339-15338-15340-15326-15211
>>>> 23-Nov 15002-15110-15212-15339-15337-15338-15326-15211
>>>> 7-Dec 15002-15110-15212-15339-15337-(15338-15326-15211)
>>>> 18-Jan 15009-15110-15212-15339-15337-15338-15326-15211
Fort William day coaches
14-Oct 15006-15104
26-Oct 15006-15104
23-Nov 15007-15104
7-Dec 15006-15102
18-Jan 15004-15104
Friday night's sleepers
1M11 CS06+CS07
1M16 CS01+CS04
1S25 CS02+CS08
1S26 CS03+CS05
So, the list of coaches not used is 15001, 15301, 15302 and 15336. The other current spares appear to be 15006, 15106, 15210, 15306 and 15340.