| 
Amount in excess of two-thirds of basic rent expended in period of two years | 
Lawful addition | 
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Not more than £100 | 
A sum equal to 15% per annum of excess. | 
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More than £100 but not more than £200 | 
A sum equal to— | 
 |  | 
15% per annum on the first £100 of excess, and | 
 |  | 
8% per annum on the remainder. | 
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More than £200 | 
A sum equal to— | 
 |  | 
15% per annum on the first £100 of excess, and | 
 |  | 
8% per annum on the second £100, and | 
 |  | 
6% per annum on the remainder. |