Does the Treason Act need updating?

Image copyright Getty Images Treason might not be a charge often associated with modern life.
A search of the Parliament website for the term mostly brings up the Gunpowder Plot of 1605. But Conservative MP Tom Tugendhat and his Labour colleague Khalid Mahmood want the 1351 Treason Act to be brought into the 21st Century.
No-one can be executed for high treason any more – that was formally abolished in 1998 – but people can still technically be sentenced to life in prison, although the Act has not been used since World War Two.
In a report for the think tank Policy Exchange, the MPs have called for the law to be updated in order to recognise “acts of betrayal”, such as fighting for IS, as a distinct crime. Mr Mahmood said the law in its current form had become “unworkable”.
This comes amid controversy over a government decision not to intervene in the case of two alleged Islamic State members.
Some people argue that other laws, for example terrorism legislation, already cover these..