If you've only just drawn down your mortgage, you'll have to check options with the bank you are currently with. No other bank will let you switch until you have a repayment history.
Under CBI rules, banks are restricted in what they can lend. I assume you're a first time buyer, so it's 90% of the value, or if renovation is needed, 90% of the value after renovation.
Is the 10k for decorating and furnishings? You won't be able to add that to Mortgage.
Your bank might have other options, such as a 2 or 3 months repayment break, that might give you breathing space.
In terms of personal loans, the best value at the moment is KBC if you open your current account with them, at 6.3%.