**Update**
Have tried again and timed it - managed to get pilot lit with CH and HW both on, lasted just over 6 mins then pilot and burner went out....it burned well and looked well lit with no distortion in flame height or colour (blue).
Does this still seem a gas issue? - the thermo cut...
I have the above boiler which has worked without issue until a couple of days ago when we started noticing a drop in water temp.
Upon inspection tonight noticed the pilot had gone out but when the water heating was switched on the fan kicked in and a clicking could be heard..I assume the...