Unsaturated fat alternative to butter - for baking?

[grannyslippers]

I always bake with real butter although I use soya/sunflower spreads for spreading

Can I just replace the butter with a spread like "Pure" (rather expensive option) or are any of those block cooking margarines polyunsaturated (i.e. like Stork)?

I'm thinking mainly of the breadmaker.

i ALWAYS use pure ths sunflower one due to my ds having allergies, doesnt seem to make diff and certainly dont get any compilaints!