UK exposure suit recommendations

Hi,

I have been away from England for some time, but now its time to
return. Since leaving I have taken up diving, but in much warmer
waters. I'm still a beginner with just over 30 dives, but I hope to
join a UK club and get a lot more experience (probably south coast).
So, I'm thinking about getting an exposure suit.

From looking round the web it seems that a wetsuit might well be OK
for the summer, but probably a drysuit for the winter. Is this
right? Do people dive in a drysuit in the summer? Is it possible to
dive in a wetsuit in the winter?

I was looking at the Mares Evolution 3-piece set thinking that this
might be a good bet, because it seems sensible to have a layer system
to me, but there doesn't seem to be many other manufacturers doing
this so is it just a gimmic? If I return in April would this suit be
OK or would I need a drysuit then?

If it doesn't start some sort of argument, could anyone reccommend a
good beginners drysuit or all-year wetsuit?

Sorry to ask so many questions, I'm just needing to think about
things.

Cheers,

Chris