My aim in past was lamb slightly earlier than most round here and hit earlier trade to help cover cost off housing so long. Had more winter grazing but lost it when sold most off sheep. Now regret it big time. The system worked well in past but it’s just the lack of winter grazing is concerning me more than anythingBy grazing what grass you have in December/Jan, you are hugely reducing the amount of growth you will get in the Spring by delaying the growth from removing leaf. Renovate your sheds/slats (it's a system that you know works and you already have the sheds), and house as soon as you fetch them back from tack. If you change to more maternal breeds you could turn out to lamb in March/April, or keep your own (terminal crosses iirc?) and lamb inside in late Feb as you do now. Lambing early to hit higher prices is only worthwhile if it doesn't incur more costs than the extra you make.
I really can't think that a system feeding straw and high levels of concentrates is going to pay where straw and conc prices are now, whatever the articles in the paper might say. It will be interesting to see if Crilly's have changed system by 5 years time.
Whatever you do though, you're not going to earn a full time income just from keeping sheep on 38ac.