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Although MI5 has become much more "touchy-feely" of late, it is still a shock for men of a certain age not only to see the Director-General but also to hear her speak.
For those brought up on John Le Carre and James Bond – although I rather suspect he was MI6 – "C", or whatever initial the top man (never a woman in those days) adopted, he was always an unseen, indeed unknown, figure.
But here, in the flesh, was Elizabeth Manningham-Buller talking to business leaders at the Confederation of British Industry Conference in Birmingham. She didn't stay to answer questions, but this was very much the new security service.
Miss Manningham-Buller's father was Harold MacMillan's attorney-general and lord chancellor, memorably renamed "Sir Reginald Bullying Manner" by the late Times columnist Bernard Levin.
I don't know about him, but Sir Reginald's daughter seemed very nice, even if her message was chilling. "There is a serious and sustained threat," she told Britain's top industrialists... and me.
Terrifying, but MI5 is galloping to the rescue. Indeed there is even a link from the CBI's website to MI5's. It works and we can use it to seek advice.
"I hope it's interactive," said another formidable woman with intelligence links. Dame Pauline Neville-Jones, the chairman of QinetiQ Group plc, was chairman of the Joint Intelligence Committee in the early 1990s but I don't suppose she said this because she expected middle-aged men to start sending e-mails to the lovely Keeley Hawes (from he television series, Spooks, which coincidentally was on the night after Miss Manningham-Buller's address).
She left (Miss Manningham-Buller that is, not Keeley Hawes) as soon as she finished her short speech. She was discreetly followed by several men although sadly none of them was speaking into his wrist (which they do a lot of on Spooks).
"What has this to do with SMEs?" I can feel you thinking. Well, quite a lot actually, even though I don't suppose Al-Qaeda is going to seek out Cheltenham-based small publishers.
There are other security threats, electronic as well as physical, and it is in all our interests to guard ourselves against them. On the same bill as Miss Manningham-Buller and Dame Pauline (one of Greg Dyke's "posh women" BBC governors, although she too seemed very nice) was David Burrill, head of group security at British American Tobacco, who Digby Jones, the organisation's chief executive, said were valuable members of the CBI as long as the law stays the same.
Mr Burrill made the point that big business is only as secure as its customers and suppliers, and we all know that suppliers are usually SMEs.
Indeed, he was asked by Hugh Morgan Williams, chair of the CBI's SME council, what security advice could be sought by companies employing less than 250 people "bearing in mind cost-benefit analysis", which I took to mean that most of us cannot afford it.
Mr Burrill replied: "Small companies which seek advice may get it from big companies who've been able to afford it. We are happy to provide advice to suppliers and I cannot think of a single occasion when we've charged for it."
But the most disconcerting fact to emerge from the session on security – the first the CBI has held at its annual conference – was not that Al-Qaeda is out there lurking (and honestly Miss Manningham-Buller, I am not being complacent). It was that 30 per cent of former employees still had access to their old firms' systems more than a year after they had left.
"Now that worries me," said Digby Jones.
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