it is fair to say that in the majority of the UK, it isn't usual to go to funerals of relatives of colleagues
Please provide your factual evidence for this.
The factual evidence is in workplaces up and down the country, every day of the year. Obviously people have time off for their own loved ones funerals, but it is not typical for factories, offices, building sites, universities, hospitals, fire stations, schools, shops, buses, demonlition sites, railways, bakeries, cafes, restaurants, cinemas, theatres, museums, sports grounds, leisure centres, and the 1001 other places people work, to all shut down every time any one person's relation has a funeral.
Yes, there will be exceptions - Pardalis being a case in point
. I can remember one time when my dc's Primary school shut for the afternoon when sadly a young teacher lost their battle with cancer. Absolutely right and proper, but you wouldn't have the whole school close a couple of times every year because one or another staff member have lost a parent / grandparent / Aunt / sibling / etc. "Factually" it just doesn't happen.