Robert Fielding, the Salisbury Diocesan church music adviser, says the organ has "fallen out of favour" because it is difficult to learn and musicians cannot practise at home.

BBC: Lack of church organists prompts young musician project

John Harrison, a researcher with Web security firm Symantec, said it is very difficult to learn the identity of the attacker, or attackers, as they could be anywhere on Earth and the infected network could span several countries.

CNN: Twitter hit by denial-of-service attack

"It is difficult - there are a huge amount of lines to learn, that's not necessarily a burden really, " said Dunbar.

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