I am well aware what the HMRC mileage rules relate to.
That's great - and I wasn't referring to anyone in particular, but having looked back at your last post to which I think you refer, you did give the impression that the OP had 'an allowance' - which may, or may not be the case, depending on his personal tax circumstances. I just thought I would clarify for those who might not fully understand how it works. Hope this helps.
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Unless you were sneaky and bought your 16-25 railcard days before your 26th birthday
As for the topic some journeys are cheaper by car and some by train. If pounds and pence are that important to you then enjoy the drive but the train has intangible benefits as Greenback has touched upon. Is the expense worth it when you lose your first day (or half of it) due to fatigue?
A car will give you privacy but a train gives you mobility (and the option to go the toilet en route)
Hopefully this party of four wouldn't end up making the journey by FGW Sprinter, or a XC Voyager on a summer Saturday. Any benefits that the aforementioned member touched on might then become rather hard to find.