Planned one-way from London to Derby during last trip to blighty. Looked on internet the night before, and there were almost *two dozen* ticket options, ranging (IIRC) from anytime/refundable/reserved-seat 1st Class at £Loads to off-hours/no dog/refunds/etc at ~£Loads/4 (about £50 IIRC). Unsure what time I'd be leaving, I decided to buy at KK/St Pancras the following day.
There I was told that the £50 option could no longer be bought - that was an internet-only previous-day special deal, so I'd have to pay £70+(!).
The return ticket was only £3 extra (WTF?), so I bought that, later leaving the return half on the ticket machine at Derby station for someone else. Petty I know but £3 well spent, just for the spite.
Here at home (in CH), returns are twice the price of singles, reduced prices (kids/OAPs/etc) are 50%; you can get at 50% card (about £250 for two years) that applies to pretty much everything (trains, tubes, boats, buses, even some cable cars). Trains are clean, have toilets, mostly run on time, etc.
What you'd expect, basically.
Funnily, the trains here drive on the left; I'm told (unconfirmed) that's because the first lines were UK designed and equipped with British-built signalling and other gear.
No, CFF has not been privatised, silly!