I was looking inside my Hager CU today and noticed that two of the
MCBs have their positive terminals linked by a purpose-made copper
link made of pressed sheet copper (covered by a removable white
plastic insulator. Additional MCBs, added more recently, for
subsequent circuits are linked by short lengths of 10 sq mm cable with
red insulation. Is this OK, or should all the MCBs be linked in the
same way?

Thank you.

Axel