I've not read everything, but a couple of points I can add.
Hamnvik, there's a Waitrose in Stirling now too :-) hope this helps you, it has me (current 3for£3 on Oatly & Alpro stuff is very good!)
bundaberg The "red" sauce I make (tomato free) is with roasted sweet potato & red pepper. Roast it all up, skins on. Take skins off (or scrape out sp after) and blitz, may need to add a bit of water. Freeze what you don't need :) You can use carrots or butternut squash, even beet root (but read somewhere this can discolour if added at the beginning, just add it at the end when you blitz) yellow or orange peppers are good too, but red peppers add the best colour to a tomato free sauce.
Mattessons pork sausage is df & SF (& GF & ef too!) great for lunches, chopped up in omelette, with pasta & Oatly sauce, always got a few in the fridge :)
Tesco has just started stocking Oatly cream (250ml black carton) round me, so that has made life much easier!
There was a thread about dairy/soya free finds with 500+ posts (not that long ago), so get a cuppa & read through it for product finds :)