When did royal mail stop delivering twice a day

Royal Mail, the UK's postal service, used to deliver mail twice a day, but this changed over the years. Here's a brief timeline:

It's worth noting that some rural areas and special delivery services, such as Royal Mail's Special Delivery Guaranteed by 1pm and Special Delivery Guaranteed by 9am, may still have a twice-daily delivery service. However, for the majority of the population, mail is delivered only once a day.