Normally you should avoid contacting the informer again.
However, there will be some cases where it may be essential to
clarify information contained in their letter or to find out more.
Before contacting the informer, you must carefully plan what
you intend to say.
You should keep a record of
If you do need to ask questions of an informer, you may only ask questions that you believe they might know the answer to, or might be able to find out be consulting personal papers already in their possession. You should make it clear from the outset that you are only seeking information
and
you should make it clear that you do not want them to find
out more.
If the informer suggests that they will find out more
information, you can say that ‘HMRC is regulated by the
Regulation of Investigatory Powers Act 2000 and this means that we
must seek authorisation before allowing somebody to find things out
for us. Our policy is only to seek such authorisation in the most
serious of cases.’
You should try to dissuade the informer from attempting to
find out anything more.