The Serious Fraud Office has confirmed it has opened a criminal investigation into the commercial practices of GSK and its subsidiaries.
It appealed for whistelblowers from the company to help them with their inquiries.
Whistleblowers are valuable sources of information to the SFO in its cases.
We welcome approaches from anyone with inside information on all our cases including this one - we can be contacted through our secure and confidential reporting channel, which can be accessed via the SFO website.
The scandal is the latest in a number of corruption probes in Iraq, Poland and China against the company.
Anyone with any information can contact the Serious Fraud Office confidentially through their website.
More top news
The five living former US presidents appeared together for the first time since 2013 to raise money for hurricane victims.
Some 465 seats are up for grabs in the lower house, which Abe dissolved last month to call a snap election amid rising approval ratings.
Ministers are also looking at schemes such as “lock-in agreements” to reduce the 250,000 sales that fall through annually.