I can't find who said it now in the thread, but I agree with them that £300 a month after payment of rent should just about be enough for most students to get by. Not generous, but do-able, which is how student grants used to be.
I do feel for the student described somewhere else in the thread who wants to become a doctor and is very very stressed at the prospect of the huge burden of debt s/he will have to take on before s/he gets a sniff of any proper earnings, years down the line.
Nobody has mentioned in the thread, I think, that there is charitable funding up for grabs for some students. A book used to be available called 'The Directory of Grants and Trusts' which listed all the funding bodies and who offered what to whom. But if it's no longer published, poke around the internet (try putting in the words 'educational charities' or 'funding help for students' and similar such things - you'll soon be able to start refining your search.)
Finally, it is definitely worth comparing the financial packages different universities offer. Some give out their own bursaries to top up the little grant to which your child may or may not be entitled. Some boost things up a bit further with additional bursaries for entrants with particularly good A Level grades. And for the fortunate few who get into Oxford or Cambridge - those two universities offer the best no-strings funding of the lot.
The sooner we go back to higher education on the state, the better.