They're all the same. We tend to alternate between the company we had the mortgage with and another one, each time getting an on line quote. They're both good at paying out, We've only had a couple of small claims but good service.
For the cars we nearly always re insure with one company (the other one above) but not by renewing as it's too expensive. We always cancel and take out a new online policy as it's considerably cheaper. Again excellent service on the three claims we've had in nearly 20 years.
The kids insure elsewhere as they are too pricey for their agegroup.