Gently heat the butter and golden syrup in a large saucepan. Then, add the vanilla extract and the chocolate. Stir until all of the ingredients are melted and combined.
Remove from the heat and stir in the pretzels, shredded wheat, raisins and nuts.
In a springform tin, spoon in the chocolate mixture. Use a spoon to press it up to the edges and create a well inside.
Chill for 1 hour.
Remove from the tin and place a few extra pretzel pieces around to give a nest look. Fill the nest with chocolate eggs and enjoy!