I've read through most of the replies here, and what great advice everyone has offered! Cascode, this is one of the rare occasions I disagree with you. You should NEVER "dumb down" your resume. Your resume is supposed to show you at your very best, and if a prospective employer sees your experience as a possible future threat to his or her job, you don't want to work there anyway, because the suspiciousness will spill over into your boss-employee relations. You should always EMPHASIZE your strong points in your resume. Anyone worth working for will want the most-qualified person possible, and won't feel threatened by a resume that highlights just how much the applicant has accomplished over the years.
LisaE made a good point about being clear on university qualifications. The education process is so different here from that in the States, and since most employers primarily deal with British applicants, they don't understand that Americans use the terms college and university interchangeably; that it doesn't mean someone's slow or unambitious to take four years to get a bachelor's degree, as that is standard in the States; etc.
In the past, I've temped a lot in between writing and editing projects. For the most part, I've worked for editorial temp agencies (specialized to my field), but I've also worked for secretarial/administrative temp agencies. I've received countless permanent job offers from temping, one of which I accepted. Ironically enough, I got my last permanent editorial job after temping at a police organization as a fill-in administrative assistant--editing had nothing to do with that assignment--it was a PA deal for the executive director (yawn). The communications director, however, asked me about my background and realized it was cheaper to have me look over manuscripts during my slow times than to send them out to editorial agencies. She ultimately wanted me to stay on and fill her place while she was on maternity leave (which also consisted on dealing with the press, etc.), and when she got back, wanted me to continue working there permanently. I think they paid my temp agency 10 percent of my salary--not the 30 percent a recruitment agency would charge--to let me go. Anyway, that job was sufficient enough to launch a freelance career three years later.
I don't know if there are any field-specific temp agencies in NI. In D.C., there are specialized temp agencies for accountants, lawyers, editors, etc. I suspect you don't have as many options in NI, but do consider temping. And whatever you do, DON'T dumb down your resume. You might get a job, but it will be one you're overqualified for, and that guarantees misery. You need the income, so be open to temp work. But don't take any permanent job that you won't enjoy and find a challenge. Also, always be open to a career change. These days, it happens quite a lot. Just my two cents' worth.
Suzanne