Detective Superintendent Chris Bourlet of the Met's Child Protection Central Command told Newsnight reporter Angus Stickler the scale of the problem was difficult to determine.
"The roots of the problem are incredibly difficult to address, " says Dr Spottiswoode.
No, he did not worry about Anselmo and the problem of the bridge was no more difficult than many other problems.
It is hard to escape the conclusion that the energy and brains of many of these brilliant hotspot scientists might be put to better use if they looked at the really difficult problem of how governments, private industry and innovative environmental-finance schemes could help fund conservation.
At one meeting in 1975, he told them everybody wanted to avoid a statutory pay policy but he could not dodge the difficult problem of getting people to stick to voluntary arrangements.
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Ipsen, who has been working on promoting registration for the alert system, said city officials also recognize the problem, but the lack of funding makes it difficult for any action to be taken.
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In Madrid, we have the problem of the dry climate, so it's very difficult to have the clay that settles down properly.
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The fact that many of these work computers could be laptops taken home in the evening and during the weekend could make the problem of spotting smut much more difficult.
At the moment Dr Haller, who is now at McGill University in Montreal, is collaborating with Wenbo Tang of Arizona State University and Pak Wai Chan of the Hong Kong Observatory to apply Lagrangian theory to the problem of aircraft taking off and landing in difficult circumstances.
The sharply increased use of bonds and other securities has actually compounded the problem of moving such governments toward disciplined, transparent financing methods and made more difficult the rescheduling of such debt instruments during periods of financial distress.
The main problem is that the complexity of computer networks makes it very difficult to quantify risk accurately.
The problem is that it is difficult to conduct studies of RF in the laboratory using cells and animal models.
Those people who used to spend all day identifying the problems in the business now have all day to solve the problem or to develop new strategies for managing the business out of that difficult situation.
The Citizens Advice Bureau (CAB) said it was difficult to assess the scale of the problem in Wales as victims were very reluctant to report problems to the police or trading standards.
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The problem is that those difficult economic times haven't passed the rest of the world by.
This led to a third and more difficult problem, the question of who should pay for the health care program.
The problem is that algae-based processes require intensely controlled doses of sunlight that make the process technically difficult and expensive.
Grain supplies for the program in the first year would not be a problem because the government has large stocks, but implementation of the program may become increasingly difficult in subsequent years, said Madan Sabnavis, chief economist at CARE Ratings.
Greene, who is in a tight race for the Democratic senatorial nomination in Florida with Rep. Kendrick Meek, was already facing something of an image problem as a recent arrival to the state whose former employees have accused him of being a difficult boss.
He said the NHS was going to have difficult years ahead, because of tight spending but the risk was now that every problem would now be "blamed on the bill".
As the ingredients of food become ever more characterised and understood, and their links to human health established, the EFSA has a difficult problem applying a scientifically rigorous approach to health-related claims without assuming the weighty bureaucracy of a pharmaceuticals regulator.
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My spine is my biggest problem, so the loss of help at home is very difficult.
"Delivering good support on the Web is an enormously difficult problem that often involves thousands of documents, complex navigation and search tactics, and an unusually demanding customer base, " Tarter says.
The new Counter Fraud Service ran into a slight hitch initially: no-one knew just how big the problem was, and without that kind of information it was difficult to demonstrate that anti-fraud work is actually worth the money.
Honestly, though, part of the problem for us is that free will is just really difficult for our algorithms to model.
She said it was "a hugely difficult problem" to break the "grim" cycle of abuse and violence that carries on "from one generation to the next" and social workers needed to take a more hands-on approach and focus more intensely on the lives of individual families.
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It is even more difficult when trying to put pressure on the source of the problem.
All of these excuses sound viable, but the problem is we are facing increasingly difficult and unpredictable threats.
Valerie Howarth, ChildLine's chief executive, said children often found the pressure of being told about a serious problem, and then being sworn to secrecy, difficult to bear.
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