Finally finished fitting in the second sub and amp. So now I have 2 sound systems in my car for the hell of it.
Setup 1 :
Standard HK amp and sub for the SatNav, 6CD Changer, Cassette Tape, Radio and TV.
Setup 2 :
HK Speakers on their own, and a second Pioneer sub & amp for the Bluetooth kit, and iPod interface.
The downside is that the second amp takes up the rear drivers side passenger footwell, but the upside is that its easily disconnected if I do have to take passengers.