1kg royal mail second class

According to the Royal Mail website, the cost of sending a 1kg parcel using their Second Class service is:

• £5.45 for a parcel up to 1kg in weight and up to 61cm in length, width, and height.

Please note that prices may vary depending on the specific services and options you choose, such as tracking, signature on delivery, and so on. It's always a good idea to check the Royal Mail website or consult with a post office for the most up-to-date pricing information.