@ Sunbeam Road- I wasn't meaning you in my earlier comment.
Looking at the RS reference-
A few countries publish track numbers in their train schedules, but in most places you'll need to look for your platform information once you get to the station. Upcoming departures are displayed on large boards; track information is usually posted about a half-hour before the train departs.
This confuses the matter. In this country you are looking for signs to "Platforms", not "Tracks". "Tracks" is a North American word for where the trains stop.
The configuration of many major trains is charted in display cases on the platform. As you wait, study the display to note where the first-class, second-class, restaurant, and sleeping cars are, and which cars are going where. First-class cars are always marked with a big "1" on the outside, second-class cars with a "2."
Those charts happen in Continental Europe- not in the UK. Here that detail is on the overhead monitors. Here we have first and standard (not 2nd class)- the train you will be using does not have first class. Also it barely matters to you as your train will only be between 2 and 4 coaches long.
Never assume the entire train is going where you are. For long hauls, each car is labeled separately, because cars are usually added and dropped here and there along the journey. I'll never forget one hot afternoon in the center of Spain. My train stopped in the middle of nowhere. There was some mechanical rattling. Then the train pulled away leaving me alone in my car — in La Mancha. Ten minutes later, another train came along, picked up my car, and I was on my way. To survive all this juggling without any panic, be sure that the city on your car's nameplate is your destination. The nameplate lists the final stop and some (but not all) of the stops in between.
Dividing en route is very rare in the UK. Don't worry about that. We don't use external name plates on the carriages [not cars here]. We use either paper signs in the door, or more often, electronic displays on the doors of the carriages of long distance trains. That is irrelevant to the trains you are using- you will see no external signage on the carriages as it is not needed.
I know all of this is old hat to many forum users, but you are a newbie.