Not quite correct
http://multimedia.food.gov.uk/multimedia/pdfs/wildgameguide0611.pdf
"Any hunter who is registered as a food business (a paper exercise!) with the local authority will be allowed to sell small quantities (an undefined amount) of game and game meat locally to a final consumer or a retail outlet without veterinary inspection or full HACCP."
"ALL game supplied to ANY game dealer (as opposed to a retail butcher or the final consumer) must have been inspected by a "trained hunter". A numbered declaration must be attached to each deer carcass to this effect.
One exemption does exist which allows deer carcasses only still to be sold to a GHE by unqualified hunters, but each carcass will have to be accompanied by its head (less trophy), red offal i.e. "the pluck", and perhaps feet too, for the resident vet's inspection.
The circumstances of the OP's scenario are all important
"food chain" is not indicative of the selling point
was it to:
a) friend for cash
b) retail butcher for cash
c) GHE with head and pluck
d) a certain local dealer who doesn't care?
contractually when money changes hands the legal position is created
should a reseller pass the food on for further monies they also have a contract with the buyer
if you sell venison to a butcher, your contract is with them
it would be very difficult to prove that lets say, the salmonella that was passed on did not originate in the butcher's shop rather than your garden shed
The butchers and game dealers also have a responsibility to reject and look after venison that is not fit or is fit.
I know of one large GHE that claimed a carcase was spoiled before it arrived at the depot. It actually transpires the collection van had delayed the delivery by several days in order to collect other local carcases and this resulted in the spoiling!
Your DSC does nothing to protect or exonerate you from prosecution for being the source of food that causes ill health.
Neither does a lack of one mean you will get bent over further should things outside of the legal sale process go wrong