I am an expert in the medevel cathedral construction and restoration, as Im sure many here are.
There has been major renovation restoration work going on in the roof section and spire. This (below) shot is taken from the western buttress end showing the major scaffold over the roof and around the spire. This section is visible in the night photo posted uppage, taken from the top of the smoke obscured south tower. The fire seems to be in the roof, in the daytime on Monday. I speculate a contruction fire.
