Erasmus Hobart and the Golden Arrow by Andrew Fish

Erasmus, a physics and history teacher, has designed himself a time machine.  He goes back in time to meet Robin Hood just because he can. But history back then is not the same as the stories nowadays.

This is a crackingly good romp.  Robin Hood is a bit of a twonk and it is Maid Marian who wears the trousers.  Erasmus keeps getting into trouble as he tries to find out the truth about Robin and undo the changes he's probably made to history.

This book has some gentle humour to it and is a nice easy entertaining read.

http://www.amazon.co.uk/dp/B00A61ZTWW/?tag=jookuf-21