Although they're based in the south, they've just started doing quite a lot of installation work at Harleyford - based on the work they did on my boat.
They are dealer for Simrad and Raytheon. Jim's always done a good job for me.
I see from below that you've also got your eyes on a Garmin 2010. I think that's the latest chartplotter with WAAS.
If this is true, you may also consider the Simrad CR40 which is a combined chartplotter radar (won't superimpose like the new Raymarine, but still a really good product specially with the sunview screen and allows half screen radar half screen chartplotter with synced cursor).
I am a Garmin fan mainly because of their superb after care. I have given up the idea of a 2010 though because Andy can make me a better unit with a 15" flat screen monitor for about 25% less.