As I announced this week, we've taken a whole range of steps to improve aviation screening and security since Christmas, including new rules for how we handle visas within the government and enhanced screening for passengers flying from, or through, certain countries.

WHITEHOUSE: Security Review on Attempted Terrorist Attack

Now, as I announced this week, we've taken a whole range of steps to improve aviation screening and security since Christmas, including new rules for how we handle visas within the government and enhanced screening for passengers flying from or through certain countries.

CNN: Transcript: Obama outlines steps to prevent terrorism

The charity agrees with Dr Pfeffer that the screening programme information, which suggests women outside the target age range can request an appointment, can be confusing.

BBC: NEWS | Health | Women confused over breast advice

HMOs range from 25% to 100%, rates of screening for breast cancer from 30% to 90%, rates of beta-blocker prescription after a heart attack from 15% to 100%, and so on.

ECONOMIST: Your money or your life