My husband has a buy to let mortgage (in his own name) but the mortgage payments come out of our joint account. I recently found a letter from the mortgage company which showed that my husband had changed the address for this mortgage from our home to another unknown address. Then back again to our home address a few weeks later. Having viewed the mortgage payments these have been steadily increasing but only by small amounts, which is odd for an interest only mortgage. So i have checked the latest statement and the mortgage has been increased by 5k. Is it illegal to increase a mortgage without your wifes consent when the mortgage payments come from our joint account?