Sweet! Thanks for the replies guys, so shouldn't be hard then?
My idea was to feed the Live cable through the fire wall (I found a hole in the firewall already where I pip leads out, it's literally in the centre of the firewall and is nicely covered but easy to get to within the car), take that down the passengers side along with the remote cable and RCA leads and then up under the seats correct?
Gotta get the speaker wire from the amp back to the crossovers (which I've placed in the grills of the original tweeters as I've mounted the tweeters on the windscreens pillars).
Sound good?