It's a beautiful set up you have there. I have some in tanks with a full mesh lid and have never had any issues at all.
I would recommend you look for a breeder and get a nice well bred healthy hamster. I'm sure Arundel hamstery may be near you if you look for their facebook page.
The M&S Hamster club have a list here:
Midland & Southern Hamster Club
Get in touch with breeders via their facebook page or website or email or contact the secretary but check out for any in your part of the world first. It's worth it to get a nice tame hamster that has been raised properly and handled since young.
There is also the Northern Hamster Club who have a list on their website.
Hope that helps