As an example here are the 1986 WCML set formations:
WB300 Mk2d BSO, 3 Mk3a TSO, Mk3a RFB, 3 Mk3b FO, RKB, Mk3b FO (Manchester Pullman)
WB302 Mk2d BSO, 3 Mk3a TSO, Mk3a RFB, 3 Mk3b FO, RKB, Mk3b FO (Manchester Pullman)
WB303 4 Mk3a TSO, Mk3a RFB, 3 Mk3b FO, RBR, NEA (Liverpool Pullman)
WB304 4 Mk3a TSO, Mk3a RFB, 3 Mk3b FO, RBR, NEA (Liverpool Pullman)
WB305 Mk2d SO, 7 Mk3a TSO, Mk3a RSM, Mk3a FO, Mk3b FO, NEA (Manchester)
WB306 Mk2d BSO, 5 Mk2d SO, 2 Mk2d TSO, RBR, Mk3a FO, Mk3b FO, NEA (Liverpool)
WB307 Mk2d BSO, 5 Mk2d SO, 2 Mk2d TSO, RBR, Mk3a FO, Mk3b FO, NEA (Liverpool)
WB308 Mk2d BSO, 5 Mk2d TSO, Mk3a RFB, 3 Mk3a FO, NEA (Blackpool/Liverpool)
WB309 Mk2d BSO, 5 Mk2d TSO, Mk3a RFB, 3 Mk3a FO, NEA (Blackpool/Liverpool)
WB310 Mk2d SO, Mk2d TSO, 5 Mk3a TSO, Mk3a RFB, 2 Mk3b FO, NEA (Manchester)
WB311 Mk2d SO, Mk2d TSO, 5 Mk3a TSO, Mk3a RFB, 2 Mk3b FO, NEA (Manchester)
WB320 3 Mk3a, Mk3a RFB, Mk3a FO, Mk3b BFO (Glasgow portion of The Clansman)
WB321 NHA, Mk3a FO, 5 Mk3a TSO (Inverness portion The Clansman)
WB324 NHA, Mk3a FO, 5 Mk3a TSO (Inverness portion of The Clansman)
WB322 6 Mk3a TSO, Mk3a RFB, 2 Mk3a FO, NHA (Glasgow/Ayr 110mph)
WB323 6 Mk3a TSO, Mk3a RFB, 2 Mk3a FO, NHA (Glasgow/Ayr 110mph)
WB326 6 Mk3a TSO, Mk3a RFB, 2 Mk3a FO, NHA (Glasgow Central/Ayr 110mph)
WB328 Mk2d BSO, 5 Mk2d TSO, RKB, 3 Mk3b FO, NEA (Lancashire Pullman)
LL300 4 Mk2d TSO, 3 Mk3a TSO, Mk3a RFB, 3 Mk3a FO, NEA (Liverpool)
LL301 Mk2d BSO, 7 Mk2d TSO, RBR, 2 Mk3a FO, NEA (Liverpool)
MA300 Mk2d BSO, 3 Mk3a TSO, Mk3a RFB, 3 Mk3b FO, RKB, Mk3b FO (Manchester Pullman)
MA301 2 Mk2d TSO, 6 Mk3a TSO, RBR, 2 Mk2d FO, NEA (Manchester Piccadilly)
MA302 Mk2d TSO, 5 Mk3a TSO, Mk3a RSM, 2 Mk3a FO, NEA (Manchester)
CL300 Mk2d BSO, Mk2d SO, 4 Mk2d TSO, 3 Mk3a TSO, RBR, 2 Mk3a FO, NEA (Barrow/Carlisle)
CL301 Mk2d BSO, Mk2d SO, 4 Mk2d TSO, 3 Mk3a TSO, RBR, 2 Mk3a FO, NEA (Barrow/Carlisle)
CL320 6 Mk3a TSO, Mk3a RFB, 2 Mk3a FO, NHA (Glasgow/Carlisle 110mph)
CL321 6 Mk3a TSO, Mk3a RFB, 2 Mk3a FO, NHA (Glasgow/Carlisle 110mph)
CL322 6 Mk3a TSO, Mk3a RFB, 2 Mk3a FO, NHA (Glasgow/Carlisle 110mph)