The major ones anyway. they are milking phone lines at the moment big time. it's been published that pretty much anything over £10 +vat is pure profit.
I'm hoping ISP's likes AAISP, Xilo, Zen might be first, if the product comes about from openreach which should also make their offerings more competitive again vs big guns with broadband and phone line. AAISP are definitely keeping their phone line rental very low, and not gouging.
The problem for the smaller isp's at the mo is they can't compete on price especially when it comes to unlimited broadband. I'd love to be with AAISP, but my usage is pretty high, some months I stray into terabyte territory, that could get expensive fast.