Dyson DC 25 Vacuum, head brush no longer spins (Shelton SY3)

Dyson DC 25 upright Vacuum.
The head brush has stopped working so the head no longer spins around but it still vacuums / sucks as normal, everything else works normal. Tried replacing head and that didn’t fix it so that was me out of ideas how to fix.
Free to anyone who wants to collect.