This is a great option, but you're a very unusual person! Most people in this position are so self conscience about their problems with literacy that they hardly admit it to themselves never mind share it with strangers.  You have to wait for an hour and a half to get the support but eventually get the form filled in.  You are told your assessment will be carried out in about half an hour.  By this time you are starting to suffer from withdrawal symptoms; you're sweating, very hot and feel a bit sick.  Do you:
Realise that you're never going to be able to see this process through and give up

Grit your teeth and wait