Hi - hoping for any solutions to this issue

Mid seat, Driver side, wont stay locked in upright position ity just keeps falling foward into the flat position.
I have taken the cover off and looked at the cogs but have not committed to any disasembly yet!!!!

There is a "ratchet" type noise but it is slipping and not locking in place - Any ideas, quick fixes before I head off to a scrappers for a new seat?

Also any ideas for a new Headset as the youngest pushed coins into the CD slot so can no longer use the sat nav.
Old versions was the RNS310

Cheers
Bob