I’ve just received an email from Lulu who produce the books. For a limited period they are offering 10% off the purchase price. All you have to do to get the discount is enter this code at the checkout:-
JUNECONTEST10
If you do not enter this code – the normal price will still apply.
(Sorry anyone who has already purchased a copy – this offer has only just become available, is for a limited time only, and is completely beyond my control.)