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I have tried to register as a user, not business user since my access will not be frequent (applying as a retired solicitor in Scotland). I have set up my password and email confirmation. 

Probably an obvious and for me sill question. What is my "user name"?

Colin Mackay 

Colin - you'll need to contact the support team who manage the online search service you are using - Public guidance: dealing with land and property - GOV.UK
I believe the user name is your email address