A french newspaper claims it has uncovered an email which the HSBC tax whistle-blower sent to the UK's HM Revenue and Customs in 2008.
It comes after the banking giant was found to potentially have helped many wealthy clients avoid paying large sums of tax in the UK.
Our correspondent Natalie Powell reports from London…
IN: A former IT worker
OUT: SOC
DUR: 37
AIR: http://www.fsnradionews.com/feeds/0213hmrc-np-air.mp3
ARN: http://www.fsnradionews.com/feeds/0213hmrc-np-arn.mp3
FM4: http://www.fsnradionews.com/feeds/0213hmrc-np-fm4.mp3
GENERIC: http://www.fsnradionews.com/feeds/0213hmrc-np-generic.mp3
G24: http://www.fsnradionews.com/feeds/0213hmrc-np-g24.mp3
ICRT: http://www.fsnradionews.com/feeds/0213hmrc-np-icrt.mp3
RNZ: http://www.fsnradionews.com/feeds/0213hmrc-np-rnz.mp3
SRN: http://www.fsnradionews.com/feeds/0213hmrc-np-srn.mp3
VATICAN: http://www.fsnradionews.com/feeds/0213hmrc-np-vatican.mp3
NIGERIA: http://www.fsnradionews.com/feeds/0213hmrc-np-von.mp3