Hi Mate
am i right in thinking that the door lock knob is not lifting from the remote? if it iss then you'll need to get new or good second hand replacemt locks, these are avaliable on ebay, £30-£70 not sure how much new ones are, to replace these some people say you must remove the window frame from the door but this isnt true as i replaced mine without removing the window frame, you will have to have the window fully up and i did tape my window up.
hope this helps