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Okay, I've come back to report that all seems well with my boiler now, after replacing the froststat (set to 5 degrees). Thanks to everyone who took the time to offer any suggestions, in particular the tip about how only the froststat or a faulty motorized port valve can turn on the heating...

The boiler never randomly turned on during the summer, so it suggests to me it is weather/temp related. When I have both hot water / central heating timers turned off, is the frost stat the only thing that can turn a boiler on? I'm tempted to just buy another frost stat to swap over and test...

It is a Honeywell Froststat. I do not know the exact model number but it looks like this one, https://s3-eu-west-1.amazonaws.com/hbfile/pdf/KE4016.pdf These can be adjusted from 3 to 20 degrees it seems. It has never been adjusted in past few years. It has only been randomly firing up...

My boiler suddenly seems to come on at random times for a few minutes throughout the day and night. It is a Potterton Suprima in garage. I suspect the Frost Stat has become faulty, it doesn't currently seem cold enough for the frost stat to kick in. I'm guessing the pipe stat is okay, as...