Compensation isn't automatic - the other driver has to be at fault.
The level of compensation depends on lots of factors - length of time he suffers, level of pain and discomfort, loss of enjoyment and ability to perform usual tasks, loss of earnings....
For the moment he needs to keep a written record of everything - including pain and suffering, medical appointments, receipts for taxis - prescriptions - everything that he would not have incurred without the accident.