Hampton school has a great reading list for year 5 boys, if that helps. I also introduce my children and tutees to child-friendly classics.
Poems to read aloud with them:
Old Possum's Book of Practical Cats - TS Eliot
The Pied Piper of Hamlyn - Robert Browning
A Child's Garden of Verses - Robert Louis Stephenson
Songs of Innocence and Experience - William Blake
The witches' spell - Macbeth - Shakespeare
Some of John Clare's animal poems are good
Alice in Wonderland and Through the Looking Glass
Wind in the Willows
Five Children and It
The Railway Children
Blackhearts in Battersea
The Silver Sword (most unsung children's novel of our time IMO. It's just brilliant!)
Passages (choose carefully) from Dr Jeckyll and Mr Hyde, Frankenstein, any Jules Verne story, Gulliver's Travels
You could look through Lamb's Tales of Shakespeare and Lamb's Essays of Elia too.
All of these are more old fashioned prose but accessible with a bit of patience. To warm up to them, definitely read Morpurgo. To warm up to Morpurgo read Philip Pullman, Eoan Colfer and Cornelia Funke.
Louis Sachar and Anthony Horowitz are superb to introduce reluctant readers to the joys of fiction (I am very biased here towards boys' reading.)
Which Philip Pullman would you recommend as a good starting point? I've only read the Dark Materials trilogy and would have thought that was a bit 'dark' (no pun intended!)?