Martin Lewis broke the bombshell recently that 75,000 people could be getting their passport cheaper every week.
The Money Saving Expert and financial guru wants to fix this and has given out tips to help people save when applying for a passport.
This applies to renewals or when applying for the first time, reports the Liverpool Echo.
A new policy came into effect in March this year which made applying for a passport cheaper online than by post.
The cheapest way to apply for or renew a passport is online via the Gov.uk website, making it £9.50 cheaper.
An adult postal application costs £85, but if you apply online it is £75.50 and a child application is £58.50 or £49 online.
Key things to look out for when applying or renewing a passport
- DO NOT just Google 'passport renewal' - there are sites that look official and will try and charge you on top of you passport fee. Only use the Gov.uk website.
- Some countries won't allow you in, even with a valid passport. This is because UK passport last for 10 years, but some countries refuse entry if you have less than six months left. Check before you book.
Steve Nowottny, news and features editor at MoneySavingExpert.com, said: "These figures suggest that the message about March's price increases hasn't yet got through.
"While some may be choosing to apply by post so they can use Check & Send, it's likely many more simply don't know they're paying more than they need to.
"The Home Office should do all it can to help those who are unnecessarily overpaying to apply online."
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