You should expect full sick pay if your employer was responsible for your injury, plus a little extra for pain and suffering.
Have you just politely asked your employer to compensate you for the loss of income for the 7 weeks?
If the employer doesn't have a sick pay policy in place then thats not true, also "a little extra", how do you justify that to the tax man?
Legal measures are put in place to ensure that the t's are cross and i's are dotted, he should seek advice from an injury lawyer if he wishes to recieve compensation and/or loss of earnings.