On Stove Glass Crazing
I have been in touch with McElligotts in Castleisland County Kerry, the dealers I bought my stove from. John McCarthy, the man with the knowledge, says that thermal shock has caused the crazing of the glass and that is not a too common occurrence in the Blacksmith Anvil. The glass should be replace and they will arrange to have a replacement pane shipped.
Most of the crazing effect is on the side of the door that opens out. Thermal shock makes sense, as when the door is opened the first blast of cold air hits there first and it is probably cold that causes the crazing rather than heat!!
Top marks again to McElligotts and John McCarthy - the man who can.