Oscarmax great news, welcome to the ever increasing number of solar panel users. I meant to mention it before, but forgot, there is an optimal angle the panels should be set at i think its 22 degrees, i wouldnt worry too much if you cant achieve as doesnt make a great deal of difference but worth mentioning.
Our roof elevation is 30 not 45 degrees, everything looks steeper these day looking up from my walker.
Use the Energy Trust calculator for our postcode the optimum roof elevation is 30 degrees 4 kW estimated to give 3340 kW, 25 degrees 3326 kW and 20 degrees 3329 kW, we will be using a 4.4 kW system so an estimate of 3674 kW ?
Unfortunately I have suffered a brain injury and occasionally I get confused and often say the wrong thing.