Posted: 14/04/2012 at 22:38
Hi Hezzie, living in the Outer Hebrides I generally do pretty well with veg crops, eg, onions, potatos, beetroots, carrots, spinach, and peas are just a few of my successess. Never had any success with sweetcorn, just not enough heat I suspect!! 
I've got a copule of raspberry bushes and strawberry patch which both do fairly well.
Not sure what your ground is like though? here in my garden it was very "peaty" just incorporated compost over the years seems to have helped.
Good luck with the poly tunnel!! Wind being the biggest factor for us in these remote far away parts, its hard enough some days just trying to stand up!!!
( and thats without the wine)!!!
Good luck, keep us all posted.
x Miss B.