I am a languages teacher, and I'm sure that as a native speaker, you will have an advantage, and that will make you very employable. In your application, mention any other languages you can deliver (as most schools want at least two these days) as well as any other subjects you could teach, that you may have a passing interest in. Languages are often part of wider faculties these days, at our school we are in with Humanities, but I've seen them in with English too, so find out and perhaps offer these subjects too.
The fact that you are cheap will work in your favour. I'm jobseeking at the moment too, but I don't want any responsibility points, and on UPS1, I'm too expensive to hire for many schools, budgets rule at the moment.
I hope you get some interviews, there seems to be more Languages jobs around this year than last, poss due to the English Bacc (make sure you know what this is - a set of qualifications which schools are measured upon in league tables).
Ofsted are very keen on seeing a cultural aspect in language lessons these days, so if you have to teach a lesson as part of an interview, then do draw on your own experience and bring something 'real' to the lesson.
Going back after a long time must be daunting - I wish you the best of luck.