I like Pure spread. It doesn't have any trans fats in it. Here are the ingredients for the sunflower version:
Ingredients
Sunflower Oil (40%), Water, Vegetable Oils, Salt (0.75%), Natural Flavouring, Vitamin E, Vitamin A, Colour (Natural Carotenes), Vitamin D as D2, Vitamin B12.
Dietary Information
Free From Genetically Modified Ingredients
Free From Artificial Colours
Free From Artificial Preservatives
Free From Emulsifiers
Free From Dairy
Free From GM Ingredients
Free From Hydrogenated Oils
Free From Soya
Free From Gluten
We do also have butter (British, unsalted, not the spreadable type because it's got lots of vegetable oil in it) but when I use butter I spread it thicker because it tastes so lovely! Using a thin smear of Pure on a sandwich or toast when it's going to have something else spread on it too (e.g. Marmite, jam, marmalade) is an easier way to keep the calories down and doesn't really affect the overall taste.
Flora has negligible trans fats too. This is an interesting overview of the history of all this.