I had decided to either scrap Cherub or rebuild it. After some thinking I decided to rebuild but it was close.

The good bits
The basic principle seems to work OK.
The drive motors with gearboxes and wheels work well.
The shape and armour seems to take the Thor test OK

The bad bits
The lifting system is unreliable (chain snaps too often)
The lifting system is far too slow.
Batteries don't seem to last the fight.
Inner frame is far too week this gets bent up every time.

The Work I am hoping to do on the robot.
Make a torque limiter to reduce the likelihood of chain breakage.
Change the lift motor and gear ratio so the lifter will operate much quicker 1/4 turn in 1/2 second!
Lithium-ion batteries.
The Inner structure of the robot will be completely re-done no more 25mm box section rubbish this time it will be 5mm armour bulkheads, Thor proof hopefully