The ECU is a standard 14CUX unit as used in the Range Rover, however it has been re-chipped to provide the correct fuelling for the supercharged installation. 

The ECU is located on the upper panel of the passenger foot well with the main and fuel pump relay. The tune resistor and a trim pot to adjust the CO is also located here.

The Tune resistor is what tells the ECU which tune to run, there are actually 3 tunes in the ECU.  Two that are customisable and a third that puts the engine in a limp home mode.  Mark actually programmed the ECU with a Non-supercharged Tune and a Supercharged Tune.  This meant that I was able to make sure the engine ran before the supercharger installation and then simply swap the tune resistor after installation.

This picture shows the ECU in place, note the orange sticker indicating that the chip is now a "Tornado" upgrade, thanks to a little tinkering by Mark Adams.

Mark actually produced a chip based on his experience of previous supercharger installations prior to actually seeing the lightweight for real.  I drove the motor up to the rolling road using it and it seemed to work pretty well.  That's what I thought, when it actually got on the rollers it was producing 244BHP.  3 hours later after Mark and Ian's knowledge and experience had been utilised this figure was increased to 307BHP.  That's 63 BHP gained from the rolling road session.  Money definitely well spent.