How much is 15kg parcel royal mail 2nd cheapest

According to Royal Mail's website, the 2nd cheapest option for sending a 15kg parcel is their Large Parcel service. Here are the prices for this service:

Please note that these prices are subject to change, and you should always check the Royal Mail website for the most up-to-date pricing information. Additionally, there may be additional charges for services such as Saturday delivery, signature on delivery, and so on.

It's also worth noting that Royal Mail has a maximum weight limit of 20kg for their Large Parcel service, so if your parcel weighs more than 15kg, you may need to use a different service or split the parcel into smaller packages.