Hi,
you could go to a good bookshop and look for a book with samples in it. In Düsseldorf, in a bookshop called sternverlag, I've seen many of them, OK, not really many, 3-4 but there is enough information. One contained samples for secretary, interns, managers, etc, bright variety, so one could find something they needed. At the moment, I am using the Internet, too and collecting everything I like from ads, samples, etc. And I write 2 different kind of applications, one for the UK, shorter and one for the rest, more like the German applications.
Furthermore, there is a book for Business English 'Jump into Business English' with a sample in it for the UK and it is very short, maybe 5 sentences. In my opinion it concentrate on the form and is not so useful for me but still interesting.
And I would be very glad for you, if you find the job you wanted.
Best wishes,
Kathrin