Home Secretary Theresa May "was not consulted over the decision to grant Mr Ai a one-month visa", a spokeswoman for her department said.
"She has reviewed the case and has now instructed Home Office officials to issue a full six-month visa. We have written to Mr Ai apologising for the inconvenience caused."
Campaigners noted that the previous visa would have allowed Ai to attend an exhibition of his work at London's Royal Academy from September but meant he would not be in Britain for Chinese President Xi Jinping's state visit in October.
After he finally received his passport last week, Germany granted him a four-year multiple entry visa but Ai said on Thursday that Britain had denied his request for a six-month visa and restricted him to a three-week trip because he did not declare a "criminal conviction".
Ai said he had "never been charged or convicted of a crime".
Jigme Ugen, head of a US-based Tibetan rights group, described the initial decision to grant Ai a shorter visa as "purely a kowtow to Xi Jinping's London visit".
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
