I take the area heading and write a paragraph.

EG: Selection criteria - experience - need A, B, C, desirable X, Y, Z.
- written skills - need to use MS Office - desirable P, Q

My letter: I have experience with A at this role as demonstrated by ..... . I meet B and C because ..... . While doing C I obtained experience of X and Z by doing ..... . Although in a different role, while I worked in private banking I needed to do something very similar to Y and now I will explain how it links in.
I am able to use MS Office and have used Word, Excel and PowerPoint in my recent roles (explain if needed). I am also able to use Access and Publisher. I have experience of P while working in healthcare using their in-house system for monitoring patients and Q has been used for data monitoring in schools where I have worked.