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FreddieUK I didn't know that, but my journeys must have been just before the sale. I found out thanks to the names on a route map or similar in one of the carriages.
Most of the services in the South are operated by the First Group, based in Edinburgh I believe, but using brands like Great Western Railways and South-Western Railways to hide the fact.
(GWR: Weymouth via Yeovil to Bath and Bristol. SWR: Weymouth - Poole - Southampton - London, and Exeter - Salisbury - London).
First has a few others around the country including the Docklands Light Railway and - if it's even finished - HS2.
The fares on the Leeds - Settle - Carlisle route (Northern) are significantly cheaper than for comparable distances "Down Souf" !
......
By co-incidence, as I typed that the News briefly announced Britain's first battery-powered trains go into public passenger service today, on a short line serving Chingford, in Essex.
I thought all the railways in that region have been electrified for 100 years or more, but perhaps this is partly experimental, leading eventually to larger battery-electric trains capable of longer distances on the thousands of miles of lines not electrified. E.g. Exeter - London, "the Heart of Wales Line", even at 75mph over the Pennines on the Skipton - Settle - Carlisle line.