but don't forget your sister won't be paying huge amounts back, if, as you say the career she has chosen pays a lesser amount over £21K she will get an extra 10% tax from her paypacket
the graduate on 80K per year will be paying back significanlty more than her

if she is passionate about the job and getting her degree then the debt, albeit a nasty one and a huge burden over her for a good few years will be worth it in the end
if she isn't convinced by the degree and the subsequent job then maybe she should try something else

nottryingtosoundlikeafascisthere

i'll shut up now