Hi Bernadette Ann
No, you certainly don't have to inform the DWP you are going to be away for a week, and your benefits won't be affected. (Obviously, if you have been informed or you are suddenly informed that you are having any type of assessment, you would need to contact the DWP to change the date of the assessment).
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems 
