How to block my credit rating

Trying to block my husbands credit rating, due to his mental condition he keeps applying for unwanted credit. I have been told I can block it on his behalf, I just dont know how to do it?
I live in the united kingdom

In the United Kingdom, the three credit reference agencies are Experian, Equifax and Callcredit. Contact info below:

Experian Contact
http://www.experian.co.uk/contact-us/index.html

Equifax UK
http://www.equifax.com/home/en_uk

Callcredit Contact
http://www.callcreditcheck.com/contact-us