Can you give me a link to where you're getting this 80% figure?And the point you fail to accept is UK ICUs have many covid patients in them 80% of whom are unvaccinated.
I've just looked, and all I can come up with is this table from the latest government statistics that shows admissions to emergency care requiring overnight stay, and this one seems to show that there are more total vaccinated going in that unvaccinated. Do you have data specific to the ICUs as I can't find that at the moment.
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/1041593/Vaccine-surveillance-report-week-50.pdf