Bespoke Android tablets (for UK)

I will require initially only a few tablets (<5), with a larger production runs if tablet tests well and meets requirements. On going project, volumes to be circa 500+ within 3 years. Spec (minimum) of tablet: 7 inch LED screen Android operating system Touch screen (capacitive) RAM: 1 GB Internal storage: 2 GB Graphics processor: yes Resolution display: 800x480 Connectivity: micro USB 2 CPU: yes I don't really need camera, volume, etc but this does come with most tablets as standard nowadays so perhaps a good option.