CLAIM FOR DAMAGES FOR NEGLIGENCE – CLAIM FOR HANDICAP ON THE LABOUR MARKET – CLAIM FOR LOSS OF FUTURE EARNINGS – MULTIPLIER/MULTIPLICAND APPROACH – LUMP SUM APPROACH – DISTINCTION BETWEEN A CLAIM FOR LOSS OF FUTURE EARNINGS AND A LOSS OF EARNING CAPACITY – HANDICAP ON THE LABOUR MARKET – GENERAL DAMAGES FOR PAIN AND SUFFERING AND LOSS OF AMENITIES – CLAIMANT WAS A WELDER – CLAIMANT’S LEG WAS AMPUTATED DUE TO THE CROWN’S NEGLIGENCE – LOSS OF EARNINGS UP UNTIL DATE OF TRIAL TO BE TREATED AS AN ITEM OF SPECIAL DAMAGES – LOSS OF EARNINGS EXPECTED AFTER TRIAL TO BE TREATED AS AN ITEM OF GENERAL DAMAGES