Here are the steps to identify the fixed and variable costs:
1) Calculate the total cost differences between output levels. This gives the variable cost per unit.
2) The y-intercept of the total cost line is the fixed cost.
3) Plot the total cost against output on a graph and draw the total cost line. The slope is the variable cost per unit and the y-intercept is the fixed cost.
The variable cost per unit is £254 (average of differences between total costs).
The fixed cost is £95,000 (y-intercept of total cost line).
Therefore, the variable cost is £254 per unit and the fixed cost is £95,000.