I know Great Sankey really well - my parents live in Lymm and I used to go to gymnastics in Sankey as a little girl
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Agree with Piglet John that it's your house putting them off, I'm afraid. If you have plenty of viewers it's not the Rightmove listing that's at fault.
Ask the estate agent about very specific feedback, and be prepared for bad news. Could you bear to be told that your house stinks, for example?
Your house does seem dark in the photos - is it that dark in real life? If so, you may need to repaint the walls, use some more lamps, and cover the dark furniture with throws to bounce a little light around.
What looks like a stain on the photos may look worse in real life - if you're appealing to first-time buyers, they'll be scared stiff of maintenance issues and the associated costs. You need to put this right ASAP.
I suspect the worst problem is that the NW is dead as a market. Very little is selling. I was home visiting my parents recently and I saw literally hundreds of 'For Sale' signs but not one 'For Sale' board. There will be lots of people idly looking at houses, who are in no real position to move.