This year, for the first time in god knows how many years, I'm going back to a good old fashioned broker. Had enough fannying about for hours on end trying to speak to a human being whenever there's a problem. The broker is more expensive than the comparison sites are offering but I'm hoping I'll at least have someone answering the phone and hopefully helping out when needed. It works out roughly £30 more using a broker but they're offering the same level of insurance but breakdown cover is with the RAC and not Green Flag, that appears to be the only difference.
P.S. Was insured with Churchill last time. Wouldn't touch them with a barge pole ever again. Fred Karno's Circus springs to mind.