However, ♦ when the Terrorism Prevention and Investigation Measures Act 2011 retains the power to relocate individuals to another part of the country without consent under powers for the secretary of state to impose enhanced TPIM notices. ♦ This, essentially emergency power may only be used, when Parliament is not in session, i.e. between the dissolution of a Parliament and the fi rst Queen’s Speech of the next Parliament.

Source: p 72, The English Legal System 2012-2013, Gary Slapper

Are there problems with the subordinate clause that I've surrounded with lozenges (♦)?


There is indeed a problem. This is as you say a subordinate clause—specifically, a temporal clause headed by when—and there is no head clause to which it is subordinated.

I think this is probably an editing mistake: when is likely left over from an earlier draft and should be deleted.

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