I got these. The bag of linseeds will probably last a couple of years! I get the Linwoods shelled hemp seeds and all ours have loved licking them up - they are fluffy and a bit nutty. Haven’t tried the unshelled ones. The Linwood hemp seeds are for humans to put on their breakfast cereal!
https://www.amazon.co.uk/gp/aw/d/B00...?ie=UTF8&psc=1
Linwoods Shelled Hemp 200 grams (Pack of 2): Amazon.co.uk: Health & Personal Care
Holland and Barrett sell them too if you just want the one bag.