You’d need the rent to be a £1. Give you time to figure out how to make a living!
Also, you need to adequately graze the sheep (that means checking the field to make sure there are no bad plants growing and checking their stool periodically to make sure their tracts are as they should be), checking their hoofs daily, checking their teeth, if you have ewes and are breeding then spraying the males and checking up on the females in heat/ pregnancy. Making sure the grazing paddocks are safe from predators and people and escape alike.
Then you have other considerations; what are you raising them for? Wool, meat, milk or a combination of the above. Each has their own considerations.
For wool their coats have to be growing well and not tangling/ snagging anywhere and have a slightly better diet. The dyes used in breeding are a wee bit counterproductive.
Meat needs to be breeding as much as possible, that means an altered diet to keep the ewes as healthy as possible and it takes time. For example, lamb meat is actually not what you would call lambs. They’re normally around 1.5 years old when sent to the slaughterhouse, mutton is over two years, but generally around 5 (gives them time to be useful for other things, like breeding and wool).
Milk needs lots of breeding too, but you have to prepared to wean the lambs early and feed them yourself to keep the milk from the ewe. This does not always go down well.
Then you need to consider breeds suitable for the way you plan to keep them for and for the habitat they’re living in.