Ah, ok. Well I would try to keep them happy and healthy without any hard feed then, if you can. Overlarge lambs and difficult lambings are a hazard with Texels, and many breeders don’t cake at all until after lambing for that reason.
They’re crosses so that will help, but sound chunky!
I’d feed hay - as much as they’ll clean up in 10-15 mins - once a day for now, or from whenever they do seem really genuinely hungry. (Always much harder to tell with cades. They’re always greedy!)
Up the hay to twice a day from around Christmastime if the weather is poor.
Mineral bucket - *not* a feed lick, check it doesn’t have any cereal in it - from 8 weeks out. Well, or from now if you want. Crystallix red is the one we used to use, now we’re using a local organic product.
You actually want them to lose a little bit of condition between now and 8 weeks from lambing, so you can keep the sugars up from then and have them on a ‘rising plane of nutrition’ as lambing approaches.
With those sheep I think I might switch to a low protein energy bucket in the last four weeks, just to make sure they’ve enough input for milk production but not so much the lambs get too large. A neighbour in north Cumbria with similar sheep, also cades, used the Downland bucket and all was well. ETA link
https://www.downland.co.uk/product/sheep_natural_energy/