Anyway, since I'm in Lincs, I'll give TCL Solar a call since they've been mentioned positively a few times on here
I've signed up with them, the are doing an install early July, for 12 panels, 4.5kw system no battery though, £7k.
I've heard good things also but obviously cannot vouch, so fingers crossed.
They guy will try and talk you out of getting a battery though, did with us, basically says that until you have the statistics for a while, getting a battery isn't always the best option and it's worth making sure it's worth the quite hefty extra cost.
I kinda get it, if your battery is say £3.5k, you need to be confident within the life of the battery it'll save you that in electricity, the panels will, eventually pay for themselves, the battery may not.
I guess it depends on your roof space, whilst our is ok, it's not quite south facing, more like 140 on the compass, so during the winter might not generate that much.
We'll see.....
He did say it would be easy to install a battery into the existing system later.
Edit: sorry forgot to mention that does include a device that dumps excess energy generated into our hot water tank, so that should save some heating oil.