Platforms 13 and 14 are only used by Turbo operated services.
Platform 12 is primarily for the Heathrow Connect except in peak when is sometimes used by Turbo operated services.
Platforms 1-5 and 8-11 can be used by Turbo and HST▸ /Adelante
During times of disruption it is better to put a turbo on 13/14 so a HST can possibly use some of the other platforms.
Also the fact Platform 14 could have been the booked platform anyway, e.g. the train you came in on could have been going back out to Greenford?
So even though
FGW▸ tell us that local services are not less important than HST's... they are?
I could just about understand it if it was a busy rush hour, but it wasn't! Half the platforms were empty, and I am sure they stayed that way... I am fed up with having an extra 5 minutes added to my (usually) delayed train by having to walk the rest of the way. I know of no other London mainline stations where two platforms are further away from the main station than leicester square tube is to covent garden tube.. As someone else on here said a while back, it's like another station. And should be treated as such!
Its not FGW saying that.
Railways work by classing trains and by using headcodes.
A headcode is basically the identity of the train seen at the signal box and through various other railway systems.
A headcode is a 4 digit/letter code, 1A05 for example, in this case the 0640 Bristol - Paddington.
The first number is how important the train is. 1 stands for an express passenger train such as an HST. 2 would be a local surburban service such as the stopping turbo you are on. As a result your train is less important to the signal box and a class '1' train would get priority over a junction/platform.
The second letter in the headcode is the destination, 'A' referring to London, and the last two letters are the individual identity.
Hope that clears up why local commuter trains are often not given the same priority as high speed trains, regardless of FGWs view on it. At the end of the day Slough
IECC▸ (the signal box) make the decision as to which train goes in front of you, which platform etc etc