A number of Ministry of Defence systems have been infected by a computer virus including the admin networks aboard Royal Navy warships. NavyStar (N*) is the system infected, luckily it doesn't do anything too dangerous like launch Trident missiles but is used for "storekeeping, email and similar support functions". The virus was likely transferred as "N* ship nets connect to wider networks by shore connection when vessels are in harbour and using satcomms when at sea". The major impact has been the loss of the e-mail service which sailors use to keep in touch with family and friends.
Don't worry lads, this is fine. (Bridge controls from HMS Cumberland)
The MOD said "no command or operational systems had been affected". So now accidental nuclear war then. That's good. The RAF has also been affected.