Lemon Drizzle Cake

Light, crunchy, tangy, simple & very moreish.  How can something this delicious, require such little effort??? You'd be crazy not to try this. You'll need:

• 225g Butter
  
• 225g Caster sugar
  
• 275g Self-raising flour
  
• 2tsp Baking Powder
  
• 4 Eggs
  
• 2 Lemons (Zest and juice is used)
  
• 175g Demarara sugar