Miserable globe artichoke

in Fruit & veg
Hello, I planted a Green Globe artichoke last year. Initial growth was full and silver. Some yellow spots appeared on the leaves a few months and it has declined steadily since then. The leaves are curled and discoloured and the buds are rotting - statuesque it is not.
I read that aphids can do damage, but can they do this much damage? My soil is loamy clay - most things grow exceptionally well - and it's in full sun.

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They've been in 4 years now and I've concluded that the whole peeling, cutting and removing of the choke is a palaver tooo far so we leave the flowers to open and delight the insects and birds and then cut them down when they are tatty.
I can get artichoke hearts frozen or in oil here and that's a lot less faff.