If they are claiming a long shelf life then likely it’s irradiated. Check the labelling.
I note this on their web page:
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All our meals are prepared in UK kitchens, using high quality ingredients and without the use of unnecessary preservatives. Before cooking, our meals are vacuum sealed using an innovative packaging system to prepare them for the slow steam-cooking process. This keeps the food airtight which prevents the food spoiling. This method means our cupboard-stored meals can be safely stored without the need for refrigeration for up to 6 months, as long as the seal remains intact. Chef's Table by Parsley box, our new range of premium, chilled meals are prepared and cooked in a similar way, and can be stored chilled in a fridge for around 10 days, or in your freezer for up to 28 days.
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What's that stuff about "UK kitchens"?
Visions of gingham clad folk of any gender/leanings carefully crafting individual meals in a great network of suburban and rural back-kitchens before tearfully handing their creations over to the parsleybox supply chain. Surely not the case?