[quote OverTheRubicon]You are absolutely right to want support, he is absolutely wrong that your chance of death in the workplace is anywhere near 1 in 400. It's more like 1 in 212,766.
Below I'll link a rough calculator via Oxford University - the mortality rates come from the first peak so they're a bit more pessimistic as we now have better treatments and a lot of people with few or no symptoms weren't showing up as positive then.
According to this, as a woman over 50 with an o BMI between 30-40 your risk of death if you contract covid is around 1 in 21277 (0.036%). Given that the chance of you contracting it are still relatively low, that risk lowers again. At my school, in a covid hotspot, we've had 4 of a teaching staff of over 90 be off with positive tests, so around 4.4%. Even if the number was much higher, say 10% of teachers caught covid at your school, your risk of catching and then dying from covid caught in the workplace is 0.00047%, which is well over 1 in 200,000, and under the benchmark you said your DH set.
It's also worth noting that by ONS figures, the first wave did not show any higher death rates for teachers than for other white collar workers, it was people like hairdressers and factory workers who were far more affected
Your DH is being incredibly anxiety-inducing with his maths, he may be trying to help but it sounds incredibly stress inducing. You are almost certain to be ok. I hope you are able to get support and also vaccine priority. 
www.qcovid.org/Calculation[/quote]
Hi
As I said in the previous post, this is my assessment, and first off, thanks for a reply that uses facts and cites it sources.
I used a figure from here for the "case fatality rate":
ourworldindata.org/mortality-risk-covid?country=~GBR
That is, the probability of dying if you catch the disease, so not the same thing as the figure you have, which is (I think, if I did the same as you) " the absolute risk of catching and dying COVID-19 over a 90-day period based on data from the first peak of the pandemic"
You say "Given that the chance of you contracting it are still relatively low, that risk lowers again." That is not correct. The probability of catching COVID is already part of the calculated figure from the web page you link to.
And that ignores the fact that she is far more at risk because it takes no account of what her job entails. The whole point is that she is at higher risk because she is working in a primary school.
I am not trying to scare people (I was not aware she was going to post this); my figures may well be off, but I very much believe there is a relatively high risk, and therefore she should raise this with the HSE. I provided the calculation for that purpose; this is why we are so concerned.