Online shoppers will now be able to collect their parcels on Sundays.
Royal Mail’s Chorley Delivery Office has been chosen to pilot Sunday opening.
The centre on East Way, Chorley, will open from noon to 4pm from this Sunday.
It is hoped it will be easier for online shoppers who are not at home during the day to receive their parcels.
Royal Mail’s network of 1,400 delivery offices currently opens six days a week.
The pilot scheme will see 100 delivery offices extend their opening days to include Sundays.
The delivery offices chosen are those with the highest parcel volumes across England, Scotland and Northern Ireland.
Other centres in Lancashire also opening on Sundays are in Blackburn, Blackpool, Lancaster and Preston.
Rob Jenson, operations director for Royal Mail, said: “We are continuing to be more customer responsive and provide more options for people to receive items they have ordered online.
“I am delighted to pilot Sunday afternoon opening at 100 of our delivery offices across the UK with the highest parcel volumes, including Chorley.”
Opening the centres on Sundays adds to the options available to people who are not home when a delivery arrives.
Almost half of Royal Mail’s delivery offices already open on Wednesday evenings for people to collect their items.
Items can be delivered to a neighbouring property if no-one is home or a free redelivery to their home or a neighbour can be arranged online.
Last month, Royal Mail announced its Local Collect “click and collect” service had been made available to 20,000 small and medium online businesses, allowing customers to collect orders from post offices.
And Royal Mail’s express parcels business, Parcelforce Worldwide, also launched a Sunday delivery service in June for online shoppers through participating e-retailers.