Postal delivery times in Mill Hill will change over the next few weeks.
The Royal Mail is bringing in deliveries with trolleys and vans in the NW7 postcode area.
The company says it will continue to deliver post in the morning and for a longer period during the day.
Depending on where customers are on new delivery routes, post may arrive earlier or later than current delivery times.
No jobs will be lost as a result of the changes.
Operations director Tony Fox said: “The local delivery team is fully committed to providing a high quality service that is friendly, reliable and which delivers six days a week - just as customers have come to expect from Royal Mail.”
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