Trouble is, it doesn't work.
I have breadboarded the circuit, and when I connect the battery, it runs. But when I make the connection to simulate the edge sensor, both motors kick into reverse, but only for a fraction of a second, and then never again - further touches of the edge sensor elicit no reaction at all.
When I disconnect the battery, and trip the sensor, the LEDs light and the relays click, showing that the capacitor is still charged.
The only things in the breadboard not to "spec" are the motors - I haven't bought my intended motors yet, so I am trialling with a pair of un-geared 3V motors (these are the motors I intend to buy: http://www.ebay.co.uk item number 5855781458 )
How can I fix it so that it will react to the edge more than once in a combat?