http://forums.moneysavingexpert.com/showthread.php?t=2744362
http://www.justanswer.com/uk-plumbing/6x92k-glowworm-micron-80ff-gas-boiler-cuts-every.html
http://www.diydoctor.org.uk/forums/boiler-keeps-cutting-out-and-no-heating-or-hot-water-t6876.html
based on the above: Thermocouple problem, circulating pump (solder joints on control board giving problems). Thermocouple should be done by a Gas Safe engineer. Solder joints are easy fixes if you are confident about weilding a soldering iron
Read those threads all through and check other results for a Google search for "Glowworm Micron boiler keeps resetting"
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March 2015