Because we have the high Sharp hill to the south, the winter sunrise is an hour later than on level ground, and the sunset an hour earlier. So in the morning, there is daylight, but not sunlight, hence the tail in and sudden steep rise just after 0930 at the start of the December solstice. By March equinox, the hill has less effect. At this time of year in June, the roof is consistently outperforming all the predictions, and with the sun rising and setting in the north quadrants, the hill has no impact on the performance, because the Sun is rising and setting to the north. We should have up to 2,250 kWh harvested by the end of June (at the present average), and then we have three summer months of July, August and September to bring us to our PV anniversary of October 1.
We have had no payment from the Feed in Tariff yet, the first one can't be expected until October. I need to chase Good Energy for payment up till the April 1 date, as they are promised to pay some sort of tariff prior to starting the main FiT.