As above. best to make your own. I prefer Olive oil and malt vinegar. one third vin to two thirds oil, bit of salt chucked in and a tsp of splenda. use a bottle so you can shake it well, then pour over. Also Helmans original mayo is great.
Cardini's ceasar dressing, Paul Newman's Italian dressing. Or make your own a la Nigel Slater. 2 or 3 egg yokes, whisked. slowly add groundnut oil until its as thick or runny add you like. Season (it's nice with some garlic powder in it too) & add freshly chopped mince. Lush! & very quick. I use the whites whisked up with slender for meringues as an added bonus