Your student debt doesn't have any affect whatsoever on your credit rating. It's not seen as a normal loan. I'm £14,000 in student debt, it doesn't matter one iota to my credit rating :icon_wink:.
So I now understand (thanks for correcting me on that score). Banks, however, are sketchy at best pre-roll-out on how debts accrued under the new system will figure in applications for financial products (in which credit rating is only one qualifying factor): current attitudes to lending wouldn't fill me with optimism, though.