This particular size (20.8 g) is a common weight for the single-bar version sold in many markets, which replaced the original two-finger Time Out bar.
Here are the key details for this product:
Product Name (Full): Cadbury Time Out Wafer (sometimes called "Cadbury Time Out Chocolate Crunchy Wafer").
Description: It consists of layers of crispy wafer and a smooth cocoa or chocolate filling, all covered in Cadbury Milk Chocolate.
Weight: 20.8 grams.
Key Feature: It is designed to be a light, crispy chocolate snack, perfect for a short break (a "time out").
Nutritional Information (Estimate)