Never been to a funeral with less than 30 people at the crematorium or Church. Friends, family, even neighbours. Similar number go to the wake after, might get a few who only go to one or the other. It's common to just go the service if you only knew the deceased and not the rest of the people there. But it's generally considered poor form to skip the service and go to the wake without a good excuse.

From what I've seen from the few British people I know with Bangladeshi families you guys do tend to have a more transactional approach to extended family, though. More about competition and elevation than support. But that could just be the people I know.