Hi SomeonesMother
Send the extra information to the same address you posted your claim, make sure you add your name, address and NI number to each extra page and number the pages, 1 of 9, 2 of 9 .... 9 of 9.
Don't forget to send it by recorded delivery, check after a few days that it has been delivered and then make a phone call to check the information has been added to the system.
Gary
Nothing on this board constitutes legal advice - always consult a professional about specific problems