Ah, so have you grown veg near laurels Richard, or have I misunderstood? Obviously if you have, you are doing fine, LOL! 
In any case, good points about the mushrooms etc.
No, I have not, but there are laurels on the allotment field, and they're pretty common, so I think if they give problems, it would be well-known by now. I had a look online; various references to wearing gloves when pruning (although again I have not heard of gardeners dropping like flies when pruning plaurel), e.g. Gardeners World says:
"It's important to wear gloves and protective clothing when pruning cherry laurel, as the leaves and branches contain toxic compounds that can cause skin irritation or even respiratory issues. Avoid burning cherry laurel trimmings, as the smoke can be toxic. Instead, dispose of the trimmings in a safe and responsible manner, such as through composting or green waste collection"
So they say compost it! That implies it gets dug in (when composted)
Another interesting find was:
https://ask2.extension.org/kb/faq.php?id=723724English laurel in vegetable garden #723724
Asked September 14, 2020, 11:55 AM EDT
We recently found that English laurel is poisonous.. we cut down some english laurels to ground level and laid landscaping fabric over the top of the stumps and made a raised vegetable garden bed around them and planted cucumbers and sweet peas around them in hopes that they would not grow back. The laurels grew back right through the landscaping fabric and the vegetables. My question is: if the laurel root system inter twines with the vegetable root systems or due to their proximity to the laurels can they poison the vegetables or make them poisonous or harmful to eat. Kinda like planting carrots to close to radishes can make carrots a little spicy.
Snohomish County Washington
Expert Response
Most organic compounds are degraded or strongly bound to organic matter in soil, making it unavailable to plants. Even heavy metals, which plants sometimes take up because plants WILL take up metals, don't usually get taken up by the plants for those reasons. Just because toxic plant roots are nearby, it doesn't mean that the vegetable plants will take in any possible toxins. Plants are programmed to do what they do, and stuff in the soil that can't be used by that plant won't be taken in by the roots or used by the plant. Let's use the tomato plant as an example of how close the toxic and non-toxic plant parts can be. Tomato plants are genetically programmed to have toxic leaves, but on the same plant--on the same branch--we get non-toxic and nutritious tomato fruit. The veggies growing in under your English Laurel should be fine. Incidentally--carrots really don't pick up the "spice" from nearby radishes :-)
Alice Slusher Replied September 17, 2020, 7:50 PM EDT
There are also plants like rhubarb; the leaf is somewhat poisonous, the stems aren't! Potato seeds look like tomatoes, and are poisonous, the tubers are not (examples of parts of plants that have poisonous/non poisonous parts, and ne'r the twain, etc).
