I’ve been doing a bit of Hot Cross Bun testing this last few weeks
and I can confirm that the M&S Luxury Fruited Buns are the nicest I’ve tried so far! - when I bought mine, they had an offer of 2 packs of 4 for £3 - it was a mix & match offer on their range of different flavoured hot cross buns and they sell Gluten Free buns too, so I chose a pack of traditional buns for me to eat straightaway plus a Gluten free pack to put in the freezer for next week, when a friend who cannot tolerate Gluten is coming to visit.
I’m currently trying some Tesco “Finest” range hot cross buns, which were slightly cheaper than M&S (2 packs of 4 for £2.50) but they are not nearly as nice and definitely less fruity.
I have read that Aldi Luxury Fruited hot cross buns compare favourably to M&S buns and are only £1.25 for 4 - but I haven’t tried them myself.