First of all Grace no I don’t profess to know what the norms are in England amd sorry that this thread has gone in a different direction to the OP.
Secondly Tabby one family member not attending a funeral in no way negates what you’ve been told on here.
And you don’t seem to understand what cultural norms are. Here’s a definition ...
They are the shared expectations and rules that guide behavior of people within social groups.
Those living in the culture/sociologists are best placed to say what those norms are. This is all based on observable behaviour, it’s not about opinion. There are strong cultural expectations in Ireland around death. Not everyone adheres to them 100% but the known and understood expectations are as follows.
The vast, vast majority of deaths are announced across a number of medium, local newspapers, radio, rip.ie, social media. People (particularly of a certain age) pay attention to them.
The vast, vast majority of funerals are open to whoever would like to come. A good ‘turnout’ is viewed as positive. However it’s not obligatory for family to come by any means.
There is no expectation that you check with the family before attending. If you did this, it may even be interpreted as you having bad blood with the deceased because why else would you need to ask permission?
The catering arrangements, as discussed upthread, are very flexible to accommodate the fact that you won’t know numbers. Venues know this and can adjust. People will use their judgement and will bow out quickly if it’s been under catered.
If you don’t want an ‘open’ funeral you could have a private one. These are very rare. I have heard of 1 in my lifetime and I’m 38.
I suspect that what’s going on is that you think it’s polite to check with the family first (fine) and can’t understand why others, in another culture, don’t apply your norms (not fine).
It’s how it’s done here, it works for this society, I can’t see anyone particularly interested in changing it —and definitely not because some Brit thinks we should—