Hi John. Choice of sea fishing tackle is really dependant on exactly where your fishing, local knowledge is key. West coast is closest to me but i have fished the places you mention with average results at best. While my fluff chucking is ok, my lead lobbing is rather good

. If you find the right place and fish are in front of you, you dont need a big rod and heavy tackle, I use a shakespeare 9ft ugly stick spin with a cheap ass fixed spool reel and 15lb line. Further out and I'll use my trusty daiwa power bass for casting similar weights (less than 1.5oz)up to 120 or so yards.
Sadly many places these days require a huge cast, and for that theres no substitute for a beachcasting rod and multi reel for the shear leverage, or for chucking out huge weights to counter the current but sadly this reduces the fight markedly.
I was going to bang on about tackle and tackticks but I've had a much better idea.......... save your money and time. I'll probably get some flack for this but sea fishing in England in my vast experiance

is poor at best. Compared to what Scotland has to offer. Me and my mates have stopped sea fishing in England as compared to up-north its a waste of time/money/diesel, better to go less often and catch lots. I dont mind sharing this and if you go, please write a report, but sea fishing around the isle of whithorn is honestly as good as it gets. An hour or so past dumfries and stay at the holiday village camp site. You wont need anything other than a spinning rod and reel............ and of course your fly rod. Climb down the cliffs to the left (the steeper the cliff seems to point to deper water) and you can do a 20ft lob into 60ft of water. Silly statement time but there are so many fish around that coast you simply can't blank, and the number of species is outa this world........ here goes....... Mackeral, pollock, coal fish, grey mullet, red mullet, gurnard, ballan wrass, dog fish and bull huss, thorn back ray, place and spurr dog!!!!!!!!!!!!!!!!!!!!
If you send me a PM I'll tell you more but in all honesty as a rule of thumb, if somewhere is remote and difficult to get to, ie not fished or humanised, it will hold fish close to shore.
Get your climbing boots on.
best regards
Rob