He should be getting �3.30 an hour - see below for full info on all the rates from the DTI.
The National Minimum Wage has increased again from October 2006
The minimum wage is a legal right which covers almost all workers above compulsory school leaving age. There are different minimum wage rates for different groups of workers as follows:
The main rate for workers aged 22 and over increased on 1 October 2006 to �5.35 an hour from �5.05 an hour.
The development rate for 18-21 year olds increased to �4.45 an hour from �4.25 an hour
The development rate for 16-17 year old increased to �3.30 an hour from �3.00 an hour
On 1 October 2006 the rate of the accommodation offset increased to �29.05 per week (�4.15 per day) from �27.30 per week (�3.90 per day)
It is important to note that these new rates only apply to pay reference periods beginning on or after the date they came into law.