The series is called The Best Me I Can be written by David Parker.
The titles are as follows:
I'm a Good Friend!
I Show Respect!
I Will Keep Trying!
I Care About Others
I Accept You As You Are.
I can Share.I can Coorperate.
I Am Generous.
I Am Responsible.
I Am Positive
Here's an excerpt from I Accept You As You Are, (my favourite).

With so many others, how can that be?
Some children have different color skin.
Some are tall, and some are thin.
Some see with their fingers [the picture is of a child reading Braille] or talk with their hands.
Other children ride because they cannot stand.
I may not know their names or their family, but all the children who I see are important just like me.

Each book also comes with a 'Try This' idea to help you and your child to interact with the book.
The books cost me 1 British Pound each which really is a bargain since quality childrens books are hard to come by these days.
I've searched online and it seems there arn't many places that these books are available, Amazon has one or two available and so do Scholastic.com. The main website is hellodavid.com to purchase the books, that's if you wanted those particular titles mentioned (there are more titles than that though.)
If anybody from Manchester would like me to bring some books back for them (or anybody from outside Greater Manchester if you are likely to see me or my husband at some point,) you can leave your Name and Number in this comments section (I will not display them) or you can email me. Please state the titles and how many you would like.