In the event, the first bolt was almost on top of us! We went to the Mairie to ask them to ring Orange for us and after a couple of days, a technician rang to say he would call. He replaced the burnt out box and said we had phone and Internet back, but would need to replace two filters. In the event, our router and live box also needed replacing, as our very competent expert, Nick explained the next day. He replaced the two boxes with a single combined second hand box which seems to be working well. I got the lights and power on again by resetting the fuse switch and luckily that was the extent of the damage.
Phew even the thought of that huge bang gives me the cold shivers! Bye for now!