Sounds very much like the OP is crap at both financial management as well as poor planning and is behaving with petulance.
Maintenance grants can be supplemented with part time and holiday work. Low income family maintenance loans exceed £11,000 for London and £8300 outside.
A return train ticket London to Edinburgh can be had for £45 booked in advance with a railcard.
It's not meant to be punitive, neither is it meant to be a free lunch.
We do not know the full circumstances, but it does appear that leaving £250 to last until April including rent, is not living a hard student life.
But of course, since someone struggles financially they must be a brat with poor organisation and not someone going through a **** time with a family that delivered false promises.