Hi Carol
Since you haven't yet been invited to apply for PIP, you might be as well just to have your mail forwarded along to your temporary address, so that you can deal with the issue if if does arise. If you'll be moving around, perhaps you have a member of your family who can deal with your 'brown envelope' mail and let you know if something turns up.
If you are concerned, however, you could contact their office, see
Welcome to Benefits and Work Hope you enjoy your holiday!!