You can dive wet all year, you won't enjoy it, but you can.
I dive dry all year as do most of the 'long term' divers I know.
Especially on a 'two dives a trip' day a drysuit pays off and
there is no problem at all diving dry in the symmer. You are
never too hot in the water and out of the water you just open
it up.

There is a huge choice in drysuits... It's like asking what car
should I buy. 1000 opinions and most just saying I like the
one I have. I like my Otter Britanic but it isn't the only good
suit out there.
http://www.nigelhewitt.co.uk/diving/rant/index.html#drysuit

nigelH

Dry suit ALL the year round for me, without doubt.
Would even dive the northern med in it up for winter months.
Also, Neoprene for me - harder to get into, but much warmer and comfortable.

The water is still going to be pretty cold in the sea in April. You
could dive in a wet suit and the dive would probably be OK, but you'll
really notice the cold once you get out of the water. You'll notice that
all the dry-suit divers will have taken off their suits and and are
having a nice cup of tea in the wheelhouse, while you're sitting out in
the rain!

There's really no reason not to go for a dry suit. Anyone who uses
neoprene will tell you they're the best, and so will anyone who uses a
membrane so in one way you can't lose.

Personally I'd go with a membrane suit - it's easier to vary the amount
of insulation to suit conditions and most importanlty the buoyancy
characteristics are more consistent. You don't need vast amounts of suit
to sink a neoprene suit that will then compress at depth and leave you
overweighted and cold.

If you're going to join a club, you'll get good advice from the members.
In terms of manufacturers for an entry level drysuit, you will probably
end up talking to Otter, Northern Diver and Roho. If it were me, I'd
also talk to the smaller outfits such as Hammond Drysuits and Gryphon
Drysuits, who both make really good suits for the price and offer a very
high level of customer service.

OK being the word, not ideal but useable sometimes. In the water it's
not so bad but sitting on a moving rib in a wet wetsuit isn't fun.

Oh yes, wetsuits are for foreign.

Get some drysuit training, try a couple of shop suits, get used to
them being ill-fitting and leaking then buy something made to measure.

In my most normal tone of voice..

Bugger that.
Drysuit all year round in the UK without doubt.
Sooooo much nicer to come out of the water with only your hair a little
damp.
Oceanic Flex 2000 has been my drysuit of choice since about 2002.

Andy
--
Always in it, just the depth that varies.