OK. So after speaking to a local domestic IT suport company it turns out I am the 45th person in 10 days they have seen with the symptoms painfully laid out above. So I'm not going mad after all.
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This is a modified version of an email I sent customer services at Wanadon't. If you read the first paragraph you get the idea. The rest of it is the trouble shooting that I carried out. If anyone kno ...