From my (many) conversations with the EHO at my local council, it's not quite as straightforward a process as it is for processed fruit/preserves/home baking - because meat is classed as a 'high risk' product.
Ours was looking for a double commercial style sink, seperate, automatic hand wash facilities, walls which were washable and without shelves/cupboards above (risk of contamination) fly screens on all doors and windows etc. You need some way of maintaining a cool working environment and have a seperate area for storing 'processed' meat - a blast freezer will also be needed if you're not selling all fresh. It's by no means impossible and your EHO might be a bit more relaxed about it (you've got to remember mine covered the area where there was an ecoli outbreak in a butchers a few years back that caused many deaths - possibly slightly more hung up on it than most) but definately worth asking the question. They're really helpful and are just trying to keep everyone safe.
Because we're not processing massive numbers of pigs (less than 40 a year) it's just not cost effective for us to put in all that's needed here to allow us to do it on-site, so unless the number of pigs goes up dramatically or I have a wee lottery win it's likely to stay that way.
Labelling differs depending on whether you're selling direct or through shops - direct sales require less information (the theory being that people can ask you what's in the product when they buy from you) but to supply via another source you've got to go the whole hog (if you pardon the expression

) and list each and every ingredient, potential allergens etc. The legislation makes for interesting bedtime reading (not !)
HTH