Here' a tip. If a wire comes loose on the circuit board, check the silver tracks on the board if the tank malfunctions after you have soldered the wire back on. I just ordered and fitted a new board, only to discover it wasn't the transistors the end of the wire that came loose had cut tthrough the conducting strip that led to it. Doh!!

Anyhow, it's all back together and working perfectly again, having had the following updates.

Metal front sprockets.
Metal idler wheels.
Metal tracks.
Metal suspension supports and chassis liners.
Metal Cupola with spring loaded hatch and machine gun.
Metal opening front hatches.
Metal gearboxes and white cap motors.
All of the moulded tools and boxes ground off.
Armour attacked with a dremel.
Original tow ropes removed, airbrushed and replaced.
Everything airbrushed, then weathered.

Just need some metal tools and other bits to stick on Der Tiger, and it will be just about finished!!

Thanks for the help and advice, and Pugwash had the bits with me in no time.

Cheers

Rob G