I'm not remotely religious so asking this question probably makes me a hypocrite but anyway. Most of us were exposed to the rite-of-passage primary school dirges such as When A Knight Won His Spurs (I'm not sure that's even a hymn) and The Golden Cockerel but I'd be surprised if the likes of these featured in a Christian Church service. But, to answer my own question, I think Abide With Me is my favourite, followed closely by Morning Has Broken. I concede these might be popular choices but I don't know that many hymns to begin with
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