I say swap your surplus meat with friends or family and ask for things in return that have value for you. Maybe that keeps you within the law and helps you sleep at night.
If only it did - technically as long as the meat has been killed in an abattoir, cut in a cutting plant, packaged there, labelled correctly, displayed (if need be) in hygienic surroundings & moved at correct temperatures, then you're all ok. Any change to any of the above starts to get you into more murky waters.
Giving meat away is still considered a "placing on the market" so is not allowed unless the above is followed.
For instance a butcher as opposed to a cutting plant (the latter has a meat inspector present) means that legally you cannot sell your meat to the public (this is the difference between a wholesale butcher and a retail butcher). I don't know any TS that will do you for this, but that is the law, although as far as I know you can still sell privately from a retail butcher - that is to persons known to you under a personal agreement between you - ie not advertised.
Killing yourself - that is killing the animal not suicide! (or any killing at home by anyone else) means only your immediate family living with you can eat it.
Start doing a process to meat - eg sausages, cutting at home, or cooking and you'll need EH involved, and need a food certificate. Packaging and labelling within a domestic environment is possible, but you'll need to satisfy EH that you can get and keep your surfaces clean - that means no pets in the house, and the right weigh kit! We have friends who used to do this, but TS were very hot on them and regularly checked, and they had a chill van that the meat came straight out of and straight back into, then direct to farmers market - a domestic fridge would be a real no-no. Anything beyond just packing, and you'll need dedicated areas - expect to pay several thousand and not be able to use it for anything else !