Amp
http://www.maplin.co.uk/p/prosound-2-channel-1600w-power-amplifier-n91fn
Speakers
http://www.maplin.co.uk/p/prosound-500w-15-inch-loudspeaker-n94fn
Sub is end of life I think not on website, but here are the specs:
Frequency Range (-10dB) – 40Hz-2KHz
Power Capacity (Continuous pink noise) – 400W
Nominl Impedance – 4 ohms
Sensitivity (1W@1m) – 97dB
LF Driver – F1503A (aluminum)
Max SPL – 127dB
Input Connectors – 2 x Speakon
Hope that helps.
And thanks for all the help so far.