Utilize the input text as a context reference, choose the right relationship between 'Parcelforce' and 'Royal Mail' from the options.
Options: director/manager, parent organization, brand, chairperson

The continuing downturn in letter deliveries pushed revenue in the company's UKPIL business - which operates in the UK collecting and delivering parcels and letters through the Royal Mail Core Network and Parcelforce Worldwide - down 2pc.
parent organization