Don't diss
The Don!

I'll have to do a write up on my PT, but as a beginner I can see lots of inspiration there and your weather is probably similar to ours. I see you've got the 'Brassicas' in there which is interesting (cabbage like plants to us!), some grapes, toms of course which look quite tall and beans. Is that mesh to the left for growing something up? How are you ventilating it?
I need to do a lot more research, but am leaning towards watering via drips on the ground rather than spraying. I'm sure there are pros and cons for both methods and dripping is probably the safer option with my water pressure. The PT is quite big and has a lot more steelwork in the roof area, I specced it to resist storms and give me more options for hanging things from.
I also put doors in either end, but have to be here to open and close them. As long as it's breezy it blows through and vents it ok, but on a still hot day (if we ever get one) it may struggle. Back in March it was 50'c in there with the doors closed on some days and the digi thermometers blacked out, it gets a lot of sun as it sits broadside to the South.
This is the first test year to see what will grow outside and what won't. I read that squash plants grow outside, but they've done nothing bar look sick so I'm assuming too cold and windy, but I believe most of the UK has been similar this year, just 1.5 coats warmer than up here. I've got to gamble on the weather getting better or just dig them up and bring them in. The other outside veg are just slow, but again, if the weather gets better hopefully will pick up a bit.
I'm worried it'll be too hot in there for some plants and they'll bolt or suffer, but not sure, yours look ok though.
A halfway house between outside and in is of course cold frames, but a way off having some of those right now.
Then there is the option of growing Winter veg in there. I got a book on it and it isn't really about growing veg in Winter at all, more like storing plants in soil whilst they sit there doing nothing for the coldest months. They'll grow in Autumn and Spring.
Oh and then there is the possibility of using the hot compost to heat the beds in there. Again, lots of research and testing to be done, but atm i'm leaning towards a large household radiator laid flat with plants growing on top. I've already picked up a huge 6 x 2' double for free to use for that.