Brush up on the basics

Not sure if they used this when you were at school, but my mum and teachers used to bash us over the head with a book called the First Aid in English.
I thought I’d see if it’s still around and guess what ... it is!
http://www.amazon.co.uk/New-First-Aid-English/dp/0340882875

It’s a no nonsense, easy-to-use guide to grammar, punctuation and English Language basics. Even if you think you know everything, it’d probably do you no harm to have this handy and use it to keep bad habits in check.