yeah, it's normal. And don't forget the UK isn't the US. Client confidentiality doesn't exist like you think it probably does.
http://en.wikipedia.org/wiki/Confidentiality
"Recent legislation in the UK curtails the confidentiality professionals like lawyers and accountants can maintain at the expense of the state. Accountants, for example, are required to disclose to the state any suspicions of fraudulent accounting and, even, the legitimate use of tax saving schemes if those schemes are not already known to the tax authorities."