I’m not religious but I would quite like to think of a ‘proper’ funeral service, with a few favourite old hymns, and the recording of a niece’s solo of Panis Angelicus with her school choir. She has a very pure, sweet soprano - it gives me the shivers and brings tears to my eyes every time.
However unless they specifically ask, I will leave it up to dh/dds, whoever is left behind.
What I really would not want is the sort of ‘celebrant’ we witnessed at a neighbour’s funeral not long ago. To me he was inappropriate in every way, from the way he was dressed (ghastly, ill-fitting garish bright blue suit) to his over-familiar talk about someone he’d never met.