The Speed Controller has now been ordered!
For non builders, the dual controller sends signals from the transmitter/receiver to the motors that move the wheels. It does this in, whats known as, TANK mode. So both wheels are moving forward or backwards at the same time, but to turn, one stops and drives in the opposite direction, so turning your 'droid' on the spot, like a tank.
Next I bought a fuse block then [once my bank account has recovered) I need to buy two 12 volt 18amp batteries.
Other items I need are, cable, fuses, connectors, a dome controller and motor and a charger to recharge the batteries!