Neil Mortiss
if you have the boiler instructions look in the fault finding guide, the flashing light normally has a sequence to tell you the fault (the number and quickness of the flashing light) sound like its going to flame failure, this can be electrical, a problem with the gas supply or something simpler like the flame sensing electrode. Almost impossible to diagnose without seeing the boiler. Will watch for your reply if you find out what the fault finding guide says.
