Free hub has died

[Devil2575]

The free hub on my Boardman Road Sport has died. I'd like to have a go at replacing it but have no idea how to find out what part I need. The make of free hub is not listed on the spec. Any suggestions or do I need to just get the broken one off and take it too a shop?

[Devil2575]

Got a whole new wheel in the new as I couldn't get a new freehub at short notice.

Now I have my old wheel and plenty of time to have a play and work out how the bits all go together.
Getting back on the bike afer it was repaired it was obvious that the hub had been dragging for while.