After our near miss in a thunderstorm, we got home to find the ADSL router, a network switch and the network card in LM's PC had all been toasted. New router, switch and network card fitted and set up. Thundernet is dead. Long live ElectricStorm!
PS just to add to the IT woes, the next day a 30 second power cut trashed LM's C: drive too. Just as well we have backups.