The average salary for a postman working for Royal Mail in London is estimated to be around £25,830 per year. This figure is slightly lower than the overall average salary for postmen across the Royal Mail, which is estimated at £26,000 annually. It is important to note that salaries can vary based on factors such as experience, location, and specific job responsibilities. Additionally, postmen may receive benefits such as paid holidays, pension contributions, and opportunities for overtime, which can enhance their overall compensation package. The role of a postman is vital in ensuring the timely delivery of mail and packages, and as such, it is compensated fairly within the context of the job market in the UK.