Copdock Mill Niger Seeds for Birds 25kg - High-Energy, Oil-Rich Niger Seed - 100% Natural Nutritional Feed - Wild Bird Seeds for Small Garden Birds

A plastic webbing sack of Niger seed, birds seem to love them

I found these after quite a long search. The birds get through them very quickly (much of it falling on my lawn due to birds arguing over the feeders) so always shop around for a decent price and these were far cheaper than others and of the same quality.