Thanks all for the welcomes and replys. Go on the forums!
120ft long 30ft wide 10ft high polytunnel. Theres a basjoo going in there in the spring, growing lovely in pots at the moment. Strawberries are planted either side, a row of figs down the middle with bananas in the center of the fig row in the warmest part of the tunnel.
The bananas are there to make fruit punnets from the leaves. But I may as well try some edible ones too and can always use the leaf if they don't fruit. I've been looking through the varieties all right

I'll need to start with the hardiest and quickest to flower and ripen, that tolerates cool summer conditions. That's what I have to go for when picking out fruit and veg in catalogues here in Ireland.
One that stands out as being a quick ripener is Veinte Cohol, but thats only from what I've looked into so far. How long do grand nan, dwarf cavendish, dwarf orinocho, dwarf namwah take to ripen? It also depends when it flowers too right? I would need flowering to start no later than july in order for them to ripen.. Maybe someone could point my the right direction.