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You're referring to the Royal Mail's 1st Class and 2nd Class postal services!

In the UK, Royal Mail offers two main types of postal services:

1. 1st Class: This service is designed for urgent and time-sensitive mail. It typically takes 1-2 working days to arrive within the UK, and is tracked and signed for.
2. 2nd Class: This service is suitable for non-urgent mail. It typically takes 2-3 working days to arrive within the UK, and is not tracked or signed for.

Here are some key differences between the two services:

1st Class:

• Faster delivery (1-2 working days)
• Tracked and signed for
• More secure and reliable
• More expensive than 2nd Class

2nd Class:

• Slower delivery (2-3 working days)
• Not tracked or signed for
• Less secure and less reliable
• Cheaper than 1st Class

Keep in mind that these are general guidelines, and delivery times may vary depending on the specific location and circumstances.

I hope that helps!