Slightly OT but - the reason why Kings Lynn was a branch is as I recall the majority of Liverpool St services terminated at Cambridge (there may have been a couple of 'peak hours' extensions to Kings Lynn) but the bulk of it was DMU shuttle. In those days Cambridge wasn't wired from either Bishops Stortford or Royston, so there was also DMU shuttles between Cambridge and those two - and there were no through Cambridge - Kings X services.
On your second point about "downgrade" - not sure I agree with 2 of those. Can't really comment on Portsmouth.
In Kings Lynn's case it received a couple of loco hauled services a day plus DMUs. When it was wired it then received Class 317s doing through runs to Kings Cross, then 365s and now Electrostars. So it's gone from old Mk2s, to 3+2 EMU, to two 2+2 EMUs.
@AOwen, can you tell me what years your talking about here please ??
As my recollection is vastly different from yours.. For instance there used to be direct Kings Cross - Cambridge service before the GN suburban electrification scheme (Toffee Apple Class 31's), then it went to 312's KX - Royston and a Craven's DMU (Class 105) Royston - Cambridge. Then 105's being upgraded to Met Camm 101's in the early/mid 80's (typically 2tph apart from Sundays). Followed by electrification and through services with Class 317's.
As for Liverpool Street - Kings Lynn.. in the 80's Kings Lynn had a lot more than "a couple of peak hour extensions", in fact, in the evening there used to be 2 services in 1 hour direct from Liv St to Lynn!
Typically there was a Cambridge - Lynn service every other hour, with it being a 105 or 101 DMU or more typically the Mark 2's running through from London Liv St. (If memory serves me right there was approx 3 DMU services each to Lynn, the rest loco hauled. Which is polar opposite from your statment. And just for clarity I used to literally live on Cambridge station in the 80's, and have seen the above services with my own eyes, and can literally tell you what electric heated and non heated Stratford 47's hauled them!!)
On Sunday mornings we used to get Air Conditioned Mark 2's (e's or f's I think) between Liv St and Ely (thence onto Norwich).
When eletrification reached Cambridge from Stortford we had Class 86's between Liv St and Cambridge (Calling Audley End and Tottenham Hale Only), with alternate hour services changing to a Class 47 onward to Kings Lynn, and that was just off peak !!
With Class 305 and Class 308 EMU's starting to cover the slower all stations service between Liv St and Cambridge. The local rag wrote a story on how the local commuters were in uproar of the downgrading of the service from Mark 2 coaches with tables and 2 toilets to each coach to 3+2 seating and 2 toilets for 4 coach's.
Of course what followed was the eletrification to Lynn and the swapping of the off peak services to Kings Cross with a handleful of extensions from Liv St to Lynn. All Class 317's of course.
They are adequate assuming you can get a better seat in the declassified first class - which is better when compared to the 387s they run alongside. I'm not sure what part of that wasn't clear but I make no apology for your inability to read my post properly. The addition of the exclamation marks at the end of your response doesn't give your point further weight, and I'm not really sure what you're trying to convey here.
Nope, I don't suffer from any inabilities and I read your post properly. It contradicts itself !!