Times and weights are irrelevant here but time is not. Irrespective of the type of occupation, any employee, aged 22 or over, must be paid at least �5.05 per hour. See the Depatment of Trade & Industry's website, here:
http://www.dti.gov.uk/er/nmw/index.htm
(The only way that the newsagent might legally be able to vary this is by paying a 'piece rate' for each newspaper delivered. Even then, your actual pay should still meet the basic requirements of the minimum wage. There's more information about this, together with a phone number for enquiries, on that link above).
You're also entitled to a certain number of days paid holiday each year. The number of days, to which you are entitled, is 4 times the number of days you work each week. (So, if you work 5 days per week you should get 20 days paid holiday each year but, if you work every day, you're entitled to 28 days paid holiday each year). The DTI website covers this, here:
http://www.dti.gov.uk/er/work_time_regs/wtr7.htm#section 7
Chris