I'm with Zen and have a good experience over the last few years, one of the only companies where customer service has been decent - when I was on ADSL the fault

I'm with Zen and have a good experience over the last few years, one of the only companies where customer service has been decent - when I was on ADSL the fault finder on their router helped identify a nearby a problem, once BT openreach replaced the cable connectivity was really good, probably would have been given the runaround by another provider and had to live with a flakey connection.