They are 'My Big Little Fat Books' by Brimax and published in 1985. The illustrator was Ann Ricketts.
They were great to read with the children because they were so simple and the illustrations so cute.
Now they live with some of the toys in the Lego Room - my grandsons' favourite place when they visit.
Disclaimer: I hope no books have taken offence to any of the words used in this post. Big, Fat and Little are all used in the books' titles and were not meant in a derogatory way! Phew!