I reckon it's great the way people chuck solid stuff in the pot from diverse quarters - railwaymen, seasoned observers, readers of planning documents, amateur photographers, expert photographers - you name it. OK, we get the odd whiner or snide, but they usually go away when they realise there are more kindred spirits elsewhere.
This thread is one such, based on solid evidence brought to this domain, amplified by people with experience and knowhow.
My twopenn'orth on this one is that an Orangeman I spoke to some weeks ago described one of the purposes of platform re-jigging as being to enable two 4 carriage trains (I assumed he meant 319s) to fit, either coupled or not, as at the moment they would foul points beyond the platform end.
I may have misunderstood him, of course, but everything else he told me (I bumped into him several times) has turned out spot on.