@davidmccarlie we never went ahead with the year long study.
We did a short study based on two people. See results here: https://huel.com/pages/one-month-on-huel-trials
Even though this took a fair amount of time, effort, and money to arrange and conduct, we received negativity about it. E.g. it was bias (we paid for it), the sample size was too small, we only did men, we only did white men, etc, etc.
So we thought carefully about it, but decided that if we did a year long study of one person, it would cost a lot, would take a lot of time and effort but it would get immediately rejected using the same reasons stated above.
What is required to convince some people is a full clinical trial, of a large sample of mixed demographic profiles, which is not paid or by any of the complete food companies. Clearly this not something we can do.