@Lucysmum
I buy my virgin coconut oil and peanut butter (100%) from bulkpowders (online).
Wouldn't advise the htc brand of coconut oil on the top shelf at Tesco's unless its used on your face or hair. It is an excellent product for that tho.
I also buy the linwoods ground flaxseed online and the chia seeds. These are bought from the cheapest amazon sellers I can find.
I know Holland and Barrats sell some ranges of products.
High street shops that sell the flax n chia seed are few.
Make sure you get ground flaxseeds.
I've ordered Linwoods ground flaxseeds and Linwoods chia seeds on line today because, as you say, none of the high street shops sell them. As for the coconut oil and peanut butter, these are two items I've never tried before and I don't even know when or how to use them or if I would be replacing them for something else.