Here are a few websites that might be helpful as you look to switch upwards, sideways or out into another role.
I would always suggest primary research, but this a reasonable kick off point: A) Payscale - https://www.payscale.com/research/UK/Job B) Check a salary - https://www.checkasalary.co.uk/ C) Glassdoor - https://www.glassdoor.co.uk/Salaries/index.htm D) Indeed - https://uk.indeed.com/career/salaries E) Hays - https://www.hays.co.uk/salary-guide/salary-checker F) Reed - https://www.reed.co.uk/average-salary