I can't help with recommendations, but i did considerable research a couple of years ago. I decided not to go ahead mainly due to exclusions and the fact that the only ones which i thought worth having (pay out from day 1), were quite expensive for what they paid out.
Being single was the clincher though. Worth it if family relied on my income.
Oh yeah, i looked at loads on the net over 3 months but the best insurance options i received was from a financial advisor.
He was sorting out my mortgage anyway, so i didn't pay extra. But he found deals that bettered what i had found myself. And he also had knowledge on the companies that paid out quicker than others as well.