Yes you can do this, have a look at section 3.1.3.3 on page 43 of the WCA Handbook. You should also have a look at section 4.1 on page 126. The WCA handbook is on the following link
I fear that if my son has to attend a medical assessment it will be very difficult to get him there even with me as a companion. In an interview situation in an unfamiliar place with a stranger he will very likely go 'mute'or if there too long may possibly have an outburst of a half hour monologue brooking no interruption.I have discussed the IB to ESA migration and the esa50 form with him,but he has limited understanding of whats involved or the nuances of the questioning and cant see why he should attend a medical.With the high probability of muteness or an outburst,is it possible for me to act as an 'advocate' to answer the questions or otherwise he probably wont reply.
Hi S,
If you feel that your son will not be able to attend a face to face assessment, you should state this in his ESA50, giving reasons.
You should also discuss this issue with his G.P. ASAP, to ensure that you and the G.P. are in agreement, see my post here with respect to the G.P.'s input, and the ESA113 :