[mrsbean]

courgettes
cucumbers
sunflowers

no blight here also

[Yorkshire Lass]

For me it was :-

1. Raspberries (only a handful
2. Peas (everything attacked them mice, pigeons & bugs)
3. Onions (White rot  )

[Baldy]

Sunflowers (again)
Squash (hardly any developed)
Raspberries
Cucumber
Pumpkins

Meh... 

Pip pip,
Balders

[Alifink]

Squash - too cold
Carrots - carrot fly
Tomatoes - didn't water enough

[Ema]

Onions they were so small needed more food
Shallots even worse than onions
Strawberries not tastey and my new plants didn't fruit this year

[Robster]

Wow what a consensus
1. Winter squash very few and small
2. Courgettes not many off the plants
3. Summer sown broad beans chocolate fungus and blackfly

[Thrutchington]

Butternut squash. Zero despite other varieties doing ok.
Overwintering onions planted last year didn't store well.
Rhubarb wasn't at all successful.

[dmg]

everything except soft fruit and garlic

[chillimummy]

No turnips
Not many courgettes
Still waiting for sweetcorn to ripen

[andimac]

Hmmm, where to start:

Apples: 2 (normally prolific) old trees= 1 apple.

Beetroot: Last year good, this year hopeless.

Cauliflower: last year's were lovely and perfectly formed but this year's were tiny and blown before they got going.