When I did mine, I was funded by the ESPRC...
I *think* it was...
Oct 2003 - £10,500
Oct 2004 - £11,000
Oct 2005 - £12,000
So mine did go up each year... I subsidised it by doing labs and practicals as well sa working for the disability office.
My friends who were funded internally by the Uni, however were on a totally different amount of money and theirs didn't go up at all during the 3 years.