interesting point BTS, as non building fixed panels i.e solar farms, only get 8p per unit FIT, and if farmers think that is worth the investment, maybe people should look again at costs.
TBH we are all too quick to look at what this cost, and 'payback' times on things. yet in reality, you never buy a car or computer etc etc and look at payback times at all!
i have had mine in for 6months so far, and have generated 4000 units of electricity. there is all the summer to go yet too! so i am well happy. far better than the 0.1% in the bank!