[smallnamespace]

'Trading GBP' (along with other incidental currencies) is basically the job description of any FX desk at a UK bank.

Disclaimer: I used to work in capital markets at an investment bank.

[jsprogrammer]

What is the relevance of this comment?

The person arrested was "global head of foreign exchange cash trading". Is it normal for global heads to be making routine trades all day? (the article indicates it is not; again, only three trade days out of 10+)

From the article it sounds like this person was more involved in client relations/sales than technical execution.

[smallnamespace]

By the same token though, the entire FX book is under his jurisdiction, so it wouldn't have mattered if he'd delegated to another trader (except that it looks more culpable this way).