Hi, we have just been trying to buy a house for a year so know all about it! firstly, you could try HSBC (you need to bank with them). They will consider a bursary and offer a loads of money (about 4 x joint salary)-be careful not to overstretch yourself though. Also, HSBC are very strict regarding who they will lend too, you need to have excellent bank statements etc.. pref not in the red, missed any payments or had any cheques bounce and all that.
Other than that Scottish Widows do a really good graduate mortgage and consider bursary's as an income. the alternative would be to have a parent as a guarantor but remember if you miss a payment they will be liable for the entire mortgage. They also need to be in a position to beable to pay your mortgage theoretically. so unless they are minted, they might not even be eligible. get online and get phoning around! good luck
also...these two were the only ones we found who offered mortgages to PG students AND offered 100%. If you have a deposit you might find it easier but this will usually need to be 5% of house price. I think you'll find halifax only goes up to 95%