It's going to be difficult for privatisation era liveries, suffice to say that it should be colour and not logo dependant i.e newest MML still extant, same for Central Trains, it's the basic livery that should be totally defunct from mainline. So to help here's a non-exhaustive list I can think. Full green (SR, GWR or BR), Railfreight grey with or without red stripe, all BR 'sectors' except petroleum (60054), Inter-City executive (pre Swallow to you young uns). White DMU with blue stripe (provincial), original livery 150s, Regional Railways (153326 last one), GMPTE (orange?), NSE1 or 2, I think Riviera have all stock colours inc Virgin covered still, orig 158 livery (and 156 too?) DMU or EMU full blue, Jaffa Cake, Mainline blue, Load Haul, BR era Scotrail. Feel free to add more below.