Angus wrote for some reason..
2 kg Woodland Trust Forest Feast £3.99 --------£2 per kg

12.5 kg Costco N/Feast £4.68 ----------------------£0.37 per kg

We prefer, correction, our small wild birds prefer Mayfield Premium Seed
Mix. about £11.50 for a 20Kg sack. Most pet supplies can order it if you
can't find it. We have tried a lot of makes before coming to this
conclusion.
Care, if you want small birds do not get the Mayfield Classic, about £9.50
for 20Kg, too much like other seed mixes, too much wheat, therefore loved by
pigeons/doves.
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Regards
Bob H
17mls W. of London.UK