Pakistan prime minister Yousuf Raza Gilani claims modest wealth As one local newspaper, The Express Tribune, noted: "Usually, members either do not declare their real assets or they undervalue their assets." Mr Gilani, who embarked on a five-day trip to the UK on Tuesday, claimed he had no stocks and shares - just cash, one house, a plot of land and about 2kg of gold ornaments. Journalists pore over the returns for signs that public funds are being plundered. However, Hasan Askari Rizvi, a political analyst, said Pakistan's strong family structure meant assets were often held by other family members. You can't really assess the real wealth of a person. There are ways to cover it up," he said. Pakistan has one of the lowest rates of tax collection in the world, at less than 10 per cent of Gross Domestic Product. Politicians are considered experts at hiding their wealth, many ploughing money into agricultural land which is not taxed. Such is the extent of the problem, that the Federal Board of Revenue is also mulling plans to add withholding tax to weddings at expensive venues and car sales as a way of persuading more people to file income tax returns. However, Fawad Chaudhy, an adviser to the prime minister, said politicians were not misusing the system. "At least we know what property they have, the information is publicly available and people can make up their own minds," he said. Among the big winners in the past year is Shahbaz Sharif, the chief minister of Punjab province, whose worth more than doubled to £1.4m in the space of a year.