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Hi thank you for your message, please note that I will look to provide an accurate but nevertheless speedy reply to your inquiry. I am sorry to hear about your situation but I will endeavour to help you today.
So the contract between the building control is between this other person and building control?
My suggestion would be you sue the person who contracted with building control on the basis that money was paid for building control and they are not completing on their duty to obtain building control consent. You should write to them and say they need to complete within 14 days or you will bring legal action for breach of contract.
. If you want to bring a legal case you should complete a claim form using form N1 here: https://www.gov.uk/government/publications/form-n1-claim-form-cpr-part-7
Once done send it to your nearest county court: https://www.gov.uk/find-court-tribunal
You will need to contact them and pay the issue fee.
If you want to find a solicitor to assist with this process and represent you at the hearing you can find a solicitor using the Law Society find a solicitor search option here: https://solicitors.lawsociety.org.uk. You can search by town or postcode to find one near you, as well as area of law in this case contract law.
I trust this assists
Let me know if you have any further questions