Went down to the Three Counties Show & got talking to a PV installer. It transpires that there is a rumoured plan afoot to cut the payments for power generated made for new sub 10Kwp/4Kwp installations from next April. A figure of 10-20% cut is being bandied about. So, if you're contemplating PV, you need to get in quick to beat the cut. No doubt lots of others will get this idea too, it will get really busy immediately pre the event.
Thought it was too good a deal to last, so it sounds feasible.
The decision to cut payments for large arrays has already been published.