I'm near you and if you wish to come view a profitable flock of sheep in Leeds by all means get in touch.
To be honest and frank, 10 sheep is the same work as 100, and I would say I'd be shocked if you broke even with any less than 50, as you will have vet call out fees, fixed overheads etc spread over 10 sheep, or 50, those costs are roughly fixed>.
Furthermore, if you factor your time in, you will find that with 100 sheep, you would be lucky to earn £2 an hour really. Double that to 200 and your almost quadrupling your income as the first 80 or so really exist to pay your fixed time and travel / regulatory costs.
I would say veg, fruit and breeding stock production is the way to go - Breed Top quality Texel sheep and breed for easy lambing, you should be able to get 1-3 good tups on 2 acres, to sell a year at £1+ if you invest good money to start with. You'll also have 5-7 rejects to eat or sell for £70 in market.
Good easy lambing texels with a good body are in high demand - Otley, Skipton etc you see them regularly fetching £1k if theire good, bad ones usually closer to 200.