[SimonandSyril]

if you look on the small animal section of viovet they have lots of good stimulating toys I recommend:
Extendable tube
any kind of hide and seek toy (things with lots of holes in)
Here are some links to things I found:
https://www.viovet.co.uk/Ancol-Exten...f-Tube/c11988/
https://www.viovet.co.uk/Boredom-Bre...mb-Kit/c11996/
https://www.viovet.co.uk/Naturals-To...-N-Hide/c5526/
https://www.viovet.co.uk/Small-N-Fur...nimals/c21951/
https://www.viovet.co.uk/Boredom-Bre...Tunnel/c12002/
https://www.viovet.co.uk/Interpet-Su...t-Wheel/c5518/ I recommend you get a classic wheel as well as the silent spinner as lots of hamsters aren't so familiar with them
https://www.viovet.co.uk/Boredom-Bre...nimals/c22303/
https://www.amazon.co.uk/Rosewood-Bo...s=hamster+toys
https://www.amazon.co.uk/Trixie-Natu...s=hamster+toys
https://www.amazon.co.uk/Superpet-Sm...s=hamster+toys