Though I think you're allowed to sell shot game without any licence.
I had to stop running our mammal farm due to increasing spinal disabilities back in 1997 so IIRC this is what was needed then .
I've a sneaky feeling that in England & Wales you have you have game dealers licence to sell shot game to the public & also a poultry processors licence if you cut it up as well, as complying with all local EO requirements for your butchery room & waste disposal
It's worth checking on line with your local environmental officers & the licencing dept . of you local authorities .
I used to sell live rabbits direct to the processor and live rabbits to the public .
Those to the public were advised that I ws not allowed to sell killed or cut up rabbits ….but once they had paid for it if they asked me I would happily dispatch it for them , skin , gut it & joint it .
I also sold miniature rabbits direct to the public , pet shops & dealers . All except the public had to be licenced as petshops & had to have a signed up vet & be subject to severla annoying local authority inspections each year which I had to pay for and had to trach the bloody inspector about my business as they hadn't a clue about the mammals I was rearing . It was also about to a legal requirement that I had to have a city & guilds certificate of animal husbandry & care for each species of creature I was rearing . That I was teaching local vets & council petshop inspectors about my animals did not exclude me , That was the final straw for me , I sold up all stock & equipment then sold off the farm &farm house . with planning permission to construct anther four stock buildings40 x 60 mtrs .
I also had to have a game licence for rabbits that I had to carry with me when I was out shooting … there was talk of that being written off the books but it might not have been .