Yes, pigs will do all that for you!
You've a couple or three TAS members in your vicinity, so probably a good plan to see what they have available when you want them, and decide which you like best of those. There are certainly Gloucester Old Spot and Lops nearby to you.
Karen's a whizz on the space requirements so I'll leave her to answer that one with figures.
I expect to pay £50-ish for rare breed pure bred weaners, a little less for crossbreeds. The ones I've had so far have wanted to be 7 months old for pork, a few months longer for bacon (but it takes a bit of management to keep the fat down to a reasonable level as you grow them on bigger for larger and more bacon.) Weaners are usually ready to leave mum at around 8 weeks, so plan to have them for about 5 months.
If your part of the world is as 'orrible and muddy as it is here now, you would probably be best to wait until February/March, say, to get little ones. They can't cope very easily with wet mud when they're small, so it'd be best to defer getting them until the ground is drying up and the air warming up.
Plus, of course, you will be wanting to spend lots of time with them and observing them, gathering material for your new bestseller 'Talking Pigs'