Bournemouth should be on the list
Platform 1 is the siding on the London bound side, last used by the Connex slam door services to Victoria
Platform 4 is hardly used these days
Why is Platforms 3 and 6 hardly ever used at Perth station ? The only time they are used is for late night terminating services such as Glasgow/Edinburgh midnight services, which I don't understand.
The tracks between Platforms 12 & 13 at London Bridge there are points quite near the buffer stops. Only about enough to fit a two car into the gap or past another unit on Platform 13.
The predecessor of the Gatwick Express was a special sub-fleet of EMUs (4-VEG I think) which were split and joined at Gatwick to trains to/from further south. Subsidiary aspects would have been needed on the Up lines approaching Gatwick to allow this joining move to take place.
I can't remember whether the current signalling was introduced before this practice finished. Even if it wasn't, someone may have decided during the design process that it was worth retaining the sub aspects in case a similar working was needed again.
Oh I forgot to say, also the 4 terminating platforms opposite each other at Stirling, Don't understand the point of them either. I think the 2 Glasgow facing ones should be used for Locals, it's annoying to walk all across the station from a small bay platform at the other end of the main entrance.
Halifax has a platform with no track through it. The buildings are part of the Eureka business i think.
Halifax used to have 6 platforms.
The one currently with no track by it was platform 3, which served trains to Bradford & Leeds, and was an island platform with platform 4 on the other side, serving trains to Huddersfield & Manchester. Then there was another island, platforms 5 & 6, which served trains to Bradford via North Bridge and Ovenden.
Platforms 5 & 6 are now totally demolished and under the "Eureka" car park, and the edge of platform 4 can be seen from the car park, along with the magnificent station frontages, which fortunately have been preserved.
However, Platform 1 has been disused for ages, and quite a few sleepers have been removed, rendering the line unusable, yet it is still signalled, which seems rather odd to me.
Guildford has a platform 7, which physically exists but is never used, as it services a single track always accessed from platform 6, so 8 platforms but only 7 tracks.