The lender will usually ask to see ideally the last two/three years accounts. However if you haven't been trading for that time - they may ask for the last three months or however long you've been trading (the longer the better) plus projections for the next 12 months. They will also take other lending criteria into account e.g. whether you are an existing customer, savings, LTV, if you are a professional, your previous income, can they reasonably assume you can return to a similar salary range should the new business fail, etc etc.
They won't necessarily disregard the application merely because you have a new business.
As another poster pointed out there are sub prime lenders who will offer a higher interest rate and will potentially lend more. There is an option of proving your repayment capacity and trying to transfer to one of the high street lenders after one year.
You will need to shop around to see whats available to you. As said above do you really want to put additional pressure on yourself when you are just launching a new business?