oh boy. I mean, if anything Barb is underplaying how serious coeliac disease is -- like, exposure to ppm-level concentrations of gluten might not make her obviously, immediately ill but will cumulatively add up to massively increased risks of osteoporosis, cancer, & cardiac trouble, among other things. So the request to clean the grill plates is absolutely proportionate to the severity of the disease, but with my coeliac friends we just accept that I'm actually not going to be converting my entire kitchen to adequately gluten-free, so when I'm hosting I make sure to (i) get them sealed packets of coeliac-friendly food that they 100% get first dibs on, (ii) explain very clearly what I have and haven't done in terms of minimising gluten content of any prepared foods, and (iii) know what the local delivery places that are Coeliac UK-certified are so I can offer to buy them something in.