Can the visa for visiting scholars in the UK be extended?

British AV visa is only given for 12 months, but it is difficult for us to step on the visa date when we leave. Some people leave a few days late, and some even leave nearly a month late. This leads to problems for AV visa holders when they return to China, that is, if they return to China according to the visa expiration date and stay in the UK for less than one year, some problems will arise. Many people will encounter this problem, and the answers given online are not very clear. Now combine the experience of a returned scholar to sum up some experiences for your reference. First, if you stay abroad for less than one year (360 days), you will mainly encounter three problems: First, you can't apply for foreign research start-up funds; Second, it is necessary to return a certain subsidy fee to China Construction; Thirdly, in some parts of China, whether a person is an overseas returnee depends on whether you have been abroad for a full year. Second, the United States can leave one month after the visa expires, but Britain can't. A day late is overstaying. Third, the AV visa cannot be extended. Fourth, the Education Office of the London Embassy does not agree to write the time on the certificate of going abroad in the future, so it is impossible for people to go first and open the time on the certificate for one year. Fifth, although the AV visa cannot be extended, you can submit an application for extension. Even if the application is rejected, home office will give you an extra grace period of 28 days, that is, as long as you leave the country within 28 days after the visa expires, it is not considered as overstaying. But if you do this, you will have to pay hundreds of pounds more for extending your visa. Sixth, the immigration law in Britain is very complicated. Strictly speaking, as long as you leave the country within 90 days after the visa expires, and the ticket is not purchased by the British government, it will not affect your coming to the UK in the future. Seventh, but all kinds of laws and regulations are very complicated, so many people on the British border don't understand them themselves. Therefore, when you delay leaving the country, you may get into trouble at the airport. People at the border will stamp your passport or ask you to fill out a form telling you that you can't apply for a British visa next year. Tell them the law is useless. Eighth, British airports generally have no passport when they leave the country, so the probability of encountering the border is very small. Generally speaking, after boarding the plane, it is a security check, and then you get on the plane. Ninth, if you need to refund the tax at the airport, you must stamp it at the border. In this case, if the visa expires, you may get into trouble. However, the tax refund also requires that you can't come back within one year, so the impact is not great. Tenth, if someone overstays due to special circumstances such as illness, they will call or send an email to home office in advance, and home office will agree. In short, it is not a problem to stay for a few days after the visa expires. If you have the need to go to the UK frequently and are very worried about the visa issue in the future, you should consider saying hello to home office in advance before the visa expires.