1. Register for job alerts
Pick 10 organisations similar to your own and register for job alerts in roles identical to your own. Create an email address specifically for this and let the alerts begin to stack up. Set up a calendar reminder prompting you to check that email inbox every six months.
By that point, you should have enough to scroll through and see the remuneration packages being offered. This approach works best for larger organisations. If you work for an SME, you will need to register for alerts from good HR job boards (like Changeboard) or directly with specialist agencies. You might have to filter them manually for similar-sized organisations.