It was the company who installed the bins. The City of London gave the company a contract for the bins, this tracking is something that has developed after the original contract was signed.
Is the Information Commissioners Office, which used to be the Data Protection Registrar, which deals with the Register of Data Controllers. Registration requires a fee which funds the Information Commissioners Office, however this fee is only £35, or £500 if you have a turnover of more than £25 million.