If you wanted to get into engineering then... engineering internships. Have a look on Gradcracker or some other careers site like that.
In any case physics is quite an employable degree anyway. Your day-to-day job probably won't involve finding solutions to the Dirac equation, but I notice people on here sometimes think that if they can't work in the field of the degree, then it isn't employable - which is nonsense. Non-specialist graduate jobs tend to just ask for a degree, never mind what subject.
Right, I am working on the NSAA right now, and I think that Imperial had just introduced a new test for physics applicants.
I don't mean the ones for university. When you apply for internships and jobs they have their own aptitude tests which are more generalised, but they're very important for filtering out applications.