Got up this morning and woke the PC from sleep
No internet access and DSLStats couldn't see it (this may have been because the IP address allocated by the router changed and Windows was looking for the old one)
As a quick fix rebooted the router and then the Pc
All sorted although a bit of a drop in fibre sync speed
This is what concerns me - what could have caused the router to completely stop working
Unfortunately I didn't check the lights to see which were green but I believe that they all were on the grounds that a red one would have been obvious
Checking the G.INP has dropped from 48 to 46 so perhaps the cab changed something which stopped the router automatically reconnecting