Yes the clutch spring had broken and the tabs have ripped away.
After doing it I think these are actually nicer to do than td5 made up my own short alignment tool on the lathe as the splines on the box are the same as the old one, but the spigot end is much smaller.
Very important not to compress the release bearing/slave or pump too fast when bleeding as it destroys them, all included in the clutch kit instructions.