the mortgage company will possibly ask for your bank statemetns - and then ask the qeustion of where the �10,000 came from and why. You will then be forced to admit the truth " i did it to try an dlook good" or lie and commit fraud. If they don't ask you, they will in all likelihood think that you have just borrowed �10,000 and will have to pay it back. they will then think that you have more monthly commitments than you actually do have.
So long as you haven't had any problems mentioned above and you have no returned payments on your bank account, you should be fine as stated.