One relatively simple measure, which has been on the back burner for a while, is to stop the higher rate tax relief for pension contributions. It was hidden in Labour's 2010 election manifesto, but has now been shelved.
Pension contributions are paid tax free, which means that a basic rate tax payer, which most people are, get a 20% top up from the government to encourage people to pay into a pension.
However, higher rate tax payers get a 40% top up. Many small business owners avoid paying themselves an income which takes them into the higher rate tax bracket, but pay into a pension fund. It's likely that they won't be above the higher rate threshold when they retire, so they avoid paying 40% tax.
This is one of the reasons about 10% of pensioner households have assets of over £1 million. These are sometimes the same people who squeal about having to sell their family home to pay for care and object to inheritance tax.
Abolishing the higher rate tax relief on pension contributions would, apparently, save the government about £8 billion annually, which could be used to fund quality care for more people.