Feeding less common birdseeds

I feed the usual things to the birds (sunflower hearts, peanuts, niger seeds, suet blocks) and I also feed white millet to the sparrows and dunnocks.

There are a bunch of other seeds I see on bird food websites that I haven't really heard of and I was wondering if anyone uses these seeds and what birds in the UK would eat them?

- Canary seed

- Oil seed rape

- Safflower

- Linseed

- Hemp seed