What about using porridge oats (HEX B) mixed with brown sugar Splenda (not sure of the syns but I'm sure it's better than normal brown sugar) and Flora Extra Light (only 1 syn per 10g) mixed with some cinnamon, etc.
I think you can get them from lakeland - never had them, but intend to try next time i'm near a lakeland store. They are supposed to taste like butter with non of the fat - ideal for jacket potatoes etc. Hope this helps.
Sorry not been about for a while. Yes as mariejean says, they are avail from lakeland. It's sachets of butter flavoured powder, but without the fat. 1/2 syn each sachet. I use then a lot, with things like mashed pots, jackets...even put them in baked beans!!!