It is no good trying to stretch them unless they are at least leather uppers, and you can only stretch the width and depth, not the length, if they have a leather lining and upper they will stretch quicker, but if only a leather upper, buy a set of stretchers from timpsons or similar, but remember that shoes need to mold to your feet naturally as much as possible, and if you stretch the leather artificaially without letting it mold to your fit, you will probabbly end up with a pait of shoes that go too loose after a few weeks and will have to put insoles in them.