Can there by just one person listed as an officer of the company?

A limited company requires at least one person to run/ own it (unless your company is under the Limited Liability Partnership structure which require at least 2). This means you can be the only person listed as the officer/s of the company. 

To confirm, if it is just yourself running and owning the business, it is absolutely fine for you to be the only person listed on the company's statutory information available to see on the public register at Companies House.