Thank you to those of you who have left comments - it's great to hear from you.
For those of you who have tried and have been unable to because it required a Google account, I have now changed the settings. All comments will still be moderated (approved before being published) in order to filter out any undesirable graffiti but the whole process is very simple. Write your comment, type the random letters that appear in the box provided (prevents automated responses) and choose 'other' or 'anonymous'. Your comment will be sent to my email address, and from there I can publish it.