What is Most Serious Economic Problem Facing the UK?

I asked my Economics students to conduct a questionnaire, asking people in the street various questions about Economics. One Question was:

What do You consider to be the Most Serious economic problem Facing the UK at the moment. These are the most popular responses to far.

1. House Prices (50% of responses)
2. Government Debt
3. Ignorance because of fear
4. no response
5. No Problems

What I would consider the most serious Economic Problem:

1. High levels of consumer debt / bankruptcy
2. Demographic crisis - Rising retirement levels will worsen government finances and put pressure on pensions.
3. Housing Market - prospect of house price falls.
4. High prices for first time buyers - related to shortage of supply
5. Growing Current Account deficit.

• Problems with US Economy
• Problems facing Indian Economy

Feel free to add your thoughts about the economic problems facing the UK (or other countries)