Energy audits are a mandatory practice for big companies (> 250 employees).
You can use a wide range of energy auditors in the UK who provide a short consultation. They will highlight how you can save money. You can also do a telephone audit where you can gain some invaluable advice.
The government heavily promotes Energy savings. You can read more about the schemes here: https://www.gov.uk/guidance/energy-savings-opportunity-scheme-esos