While some of the gaps discussed in this thread are, I think, length gaps (most notably at Gourock because of the curve), my concern is with height gaps.
The down platform at Warrington Central has a serious height gap. I have for some time exercised great care in alighting; but a fortnight ago I had a little accident while boarding (a pacer!) and am still being treated for the graze received.
I share the concern expressed by several correspondents on this thread. I believe Network Rail have a standard platform to train step height gap (sorry I don't know what it is) while acknowledging that on many platforms, it is not met. As I think has been suggested in this thread, the problem may be getting worse at some locations. Manchester Oxford Road P4 has been mentioned. I am also finding the down platform at Knott Mill and Deansgate much harder than it was. The worst one in my experience is Bristol Temple Meads P7; there, the last two times I have boarded, I have requested the passenger behind me to give me a little push. The last time I travelled that route I was on the train from Bath, to avoid the expected difficulty at BTM.
I am aged 68, and too fat, and getting slower in all my movements, but I am not sure whether this problem is really me getting more infirm, or the platform gaps increasing, or a bit of both. Either way, I am shocked to realise that I cannot confidently use one of the platforms at one of my town's two principal stations without a risk level that is probably too high. I start most days out at Warrington Bank Quay (where there are no platform height issues) and am now having to finish there more often.
I get the impression that I am not the only ageing passenger for whom inadequate platform height is becoming a serious issue.
John Prytherch.