I keep a small flock of shetland sheep, as pets and for meat (strange combo I know!).
The paperwork was daunting at first but it's actually really straightforward, you need to be issued with a holding number and flock number, this costs nothing. You also have to keep records in a flock book provided by DEFRA for nothing, and when you move the animals (buying in, slaughter) you fill in a movement form (free from DEFRA) and send a copy to your local trading standards office.
Most of the time the sheep take up very little time and have also (touch wood!) been relatively problem free and a fun hobby. The busiest times are lambing and shearing which you would avoid altogether if you just reared lambs fro the freezer.
Our first year we did this and we just used a bag of ewe nuts food for treats, a bottle of panacur (£11) for worming and some animal citronella fly repellant spray (£6). We also bought some foot shears to trim their feet (£15). They had already been vaccinated for clostridial diseases when we got them.
We have done a course on sheep husbandry and lambing which was useful, but the first couple of years we relied on books. A good basic one is "Starting with sheep" by Mary Castell, or "Practical Sheep Keeping" by Kim Cardell, I bought both these off Amazon.
If you do get some sheep for meat it's well worth keeping the skins and having them cured and made into rugs.
If you have any questions, let me know. Good luck if you decide to go for it!
Cheers
Alex
P.S. Forgot one last thing - you need good fencing ;-)