Barrett,
You are in a minefield area, and my understanding is only second hand, so please don't rely directly on this.
A butcher (as opposed to a cutting plant) can legally cut and sell to the restaurant. They can also sell to you as final consumer. However my understanding is that you cannot legally resell that meat to a restaurant, only as a private sale to a private end customer. Any "at the gate" sales (eg sign on farm gate) from a butcher to general public are technically illegal, although this aspect is not often persued directly by TS if small scale and occasional.
If cut in a cutting plant (a cutting plant is one where a meat hygiene inspector is present), then it can be sold on to restaurant or to public, and sign at farm gate would be legal if the hygiene reqs are met.
However any steps from cutting plant to customer - eg delivery to restaurant would need to comply with Hassup principles, and a refrigerated van would on most cases be needed - two aspects a) refrigerated to keep meat cool, b) van ie separate area where only meat is carried. A short journey with say a cool box might meet the reqs, but carry in a carrier bag on the back seat wouldn't !
As a supplier to the public (the restaurant counting as this) I strongly suspect you would also need to be registered as a food suplier with local authorities - hence the "licence" bit, and TS would want to understand how you are achieving this. The following is interesting
http://www.rushmoor.gov.uk/index.cfm?Articleid=9736, and you might be exempt (or not!)
Since various governments over time have decided that we the general public should be relieved of any responsibility in making sure our food is fit to eat, these regulations are needed.