As a new business, you will be very lucky to get a �30,000 business loan which is not secured by way of property. If you do go down this line, there can be advantages with regards to claiming back the interest portion of the loan.
If you have a �15,000 personal loan, you may find this more difficult than you think as lenders are going to want to see your trading accounts before they give you a loan - to ensure that you can repay the loan.
With regard the tax purposes, I am fairly sure that this will depend on whether you are a Limited company or a partnership.