Pollack as bait?

I was fishing for some mackeral for bait for some Bassing this weekend. I caught enough eventually but my question is this. Whilst fishing for Mackeral off the rocks I must have caught 30 pollack to about 4". Thats 8cm to you young fellows :D
Would these have been any use to say freeze and use like sand eels? It's not that I want to decimate the pollock stocks by starting a craze or anything but a few were badly hooked :cry: and may or may not survive.
Whilst I've read about Mackeral being used for bait and am trying it this weekend I've never read about Pollack?
And I suppose there is a byelaw that prevents me removing these from the sea at that size :?:
Thoughts gentlefolk please......... :?

Quarterflounder,
I've caught whiting on pieces of pollock, and took plaice on razor/pollock cocktails. Also had conger on full pollock. To be honest though, conger aside, I wouldn't exactly be confident using it. Still there is no reason while large bottom fish wouldn't hoover one up.

Pete