You need to give us more information, Smow. Who are you claiming from?
Normally when a solicitor needs hospital records he asks you to sign a consent form and deals with it, charging you a lot of money for his time.
You can do this yourself for nothing, I have provided the link above.
If you are claiming compensation from the CICA they will get the medical records themselves at no charge to you.
Same as the previous question - what are you hoping to achieve?
The CICA will NOT pay your solicitors costs (because you don't need to use one to claim) so if he "wins" it will come out of your son's compensation.