I completely understand your concern about needing a cost-effective solution for front door lock replacement in London. A few months ago, I faced a similar situation, and I found an excellent locksmith service that provided low-cost lock replacement without sacrificing quality. I highly recommend https://www.autoprolocksmith.co.uk/locks-change-london/. Their team was very professional and gave me a detailed estimate before proceeding with the work. They offer a variety of lock options, from basic to more advanced systems, so you can choose one that suits your needs and budget. What I really appreciated was their transparency in pricing. There were no hidden fees or surprises, and they even helped me with some basic security advice. I believe their prices are among the best in London, and they’re known for their reliability and quick service. Plus, they are available for emergency lock changes, which is a great bonus! Overall, if you want an affordable and trustworthy locksmith service, definitely check them out.