Have you looked at Smarty's prices? They do seem to be incredible good value for money. I switched from Vodafone about 18months ago and constantly recommend them.
I liked Three. I could travel to EU, USA and Oz and not think about SIMs. They've gone to shit though after saying they wouldn't change, so on principal I will be moving away from them.
I'll check out ID Mobile and Smarty, thanks jellybaby and eskay.
Three wasn't going to remove their free roaming and then oh, look, they did.
So, yeah, Brexit delivering again.