Don't go throwing your spinning rods in cause Etive is deep :lmao:
Spinning rod is first choice for the pollack. 1/8 oz leadhead with rag or jelly worm.
Cast it at the rocky shoreline and fish it slowly back down the slope and then even more slowly up to the boat. Treat it as you would if you were fishing for wild brown trout. The water is usually calm and clear - these pollack are very shy of noise. Fish with a large group of noisy mates and you will never know they are there.
The whiting are often at mid-water. Standard paternoster rig lowered to the bottom. No bites reel it up 6ft. Keep doing that until you get a fish. I have had bags of good whiting fishing 60ft down over 120ft of water.
For whiting and spurdog take all your old bait and chop it up as groundbait.
Use the polybag/heavy weight trick to get it down. At anchor the fish will usually find you.
Had the spurdog right up to the boat, feeding off scraps a couple of times.
If you have no fishfinder try trolling a regill or ragworm very close in. You will eventually find the pollack and coalies.