Loan to make up the rest for cash buy

I'm looking to buy a flat cash for £30k. I have £17k in the bank, my credit history is rated poor as i've had no credit in the past (cant even get a credit card) I'm in fulltime employment earning £18k.

My question is, will my bank consider my £17k in savings if I ask for a £15k loan? Then buy the flat out right?

If not, can anyone suggest any other way to solve my problem? Its going to take years to build my credit report and I want to buy this place in 2 weeks.

Thanks