We're in the process of buying a house and are about to apply for our mortgage. We already have the agreement in principle. How does the application process work? The seller hasn't found anywhere to move to yet and we will be in a chain. What if the mortgage interest rates go down between applying and actually completing? Will we have to apply all over again to get the lower rate or is it worth waiting for the next BoE meeting in a couple of weeks? Anything else useful I need to know?! It's my first time buying!