The LivLife bread is a good alternative, the only other bread that doesn’t affect my BG. But only Waitrose sell it, and I have to travel miles to get to one...
LivLife does seem to be much lower in carbs than most competitors. 14.6g of carbs per 100g. Or 3.8g per slice (presumably small slices?)
Looks promising, I'll be seeing if I can find any next time I'm passing my Waitrose. I have a Waitrose about 7 miles away but it's hard to get to. Well hard to park near as it's in town. But it stays open till 10pm, so I might try driving by when it's much quieter.