Independent reading for five year olds?

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My son is doing pretty well at reading at school but is finding big chip and kipper etc a bit boring.
He'd like to read some books for himself but isn't ready for chapter books. He's level five on oxford reading tree and is pretty good at deciding or figuring it out from pictures.
He likes trains, vehicles, anything technical but is also quite into princess/animals/fairies etc.

Any suggestions on series I could get from the library for him? I don't want to scare him off with anything too difficult, but the simple toddler reading books that we have here (peppa, maisy type books) aren't interesting him. He seems to be in the middle of ability.

Crikey he's probably better at writing than me!

*biff chip and kipper

• pretty good at decoding... not deciding

I bought ds a set of ladybird read it yourself books. Some are traditional fairy tales but there's a range. He absolutely loves them and always takes a couple to bed.

I used these usborne.com/browse-books/catalogue/subject/1/YR/FRL1/first-reading-level-1/

They go up in level and they are interesting books, both fiction and non-fiction.

My 5 year old loves the topsy and Tim books

Thanks for the suggestions! I'll take a look.
I remember reading topsy and Tim as a kid

I got a set of Dr Seuss books for DS (from the Book People) which are banded by difficulty so he could start with Hop on Pop and then graduate through them. He loves the rhymes and silliness.

there’s a couple of great series about two Australian kids, one called the Billy b brown books and then a (slightly easier irrc) set, called hey jack. They are chapter books but big print, lots of illustrations, short chapters and only 3 or 4 chapters in the whole book. So a good transition into chapter books. Also I got a big set of first chapter books from the book people, in one of their 80% off sales, about 25 books, that were easy to read and a good way into independent reading.