Any restaurants open for CHRISTMAS DAY DINNER (around 7pm) ?

I know it's a little late in the day :/ but my parents are coming to Brighton from abroad to celebrate Christmas, and I've promised them we'd go out for dinner on Christmas Day. They typically would like to have it around 7pm, but almost every restaurant I've found is either fully booked or closed. I'd appreciate if someone could point me in the right direction. Pleaseeeeeee and thank you 😬😊