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.