Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
Why do you need to do this now?
Do you still wish to use both names?
Your easiest option is to complete and sign a Change of Name deed confirming that in future you will only use the Angicised version of your name.
You can find a template for free here
If you prepare one and sign it in the presence of an Independent Witness everyone will accept this as evidence that you are you!
I hope that this is of assistance - please ask if you need further details
You do not need a solicitor - a friend, neighbour or colleague will be fine