Aygo Clutch fork return spring

Hi all

I’m fitting a new clutch in my 61 plate petrol Aygo, it has a return spring on the clutch fork arm inside the bell housing, it looks like the spring is broken. The bell housing casting has a nice little groove in it next to the clutch arm, I’m assuming that the spring should sit in the groove- does anyone know if that sounds correct?  Also what the part number is for a replacement spring ? Cheers! Damian