You can currently get the Amazon Fire 7 Kids tablet, 7″ display, ages 3–7, 32 GB, around £74.99.
The Fire 7 Kids Tablet (for ages 3–7) includes a full-featured tablet, a Kid-Proof Case, a 2-year worry-free guarantee, and 1 year of Amazon Kids+ with thousands of apps, games, and videos. Features easy parental controls, up to 10 hours of battery life, and expandable storage up to 1TB.