It looks like your sentence was cut off, but based on what you've provided, it seems like you might be referring to the amount of a particular substance or material that people in Britain handle, discard, or use. A common topic related to this could be waste.

For example, in Britain, people produce around 4 million tons of a specific type of waste per year. One such example is plastic waste. However, without the full context, it's hard to be certain.

If you're looking for a specific statistic or have a different material in mind, please provide more details so I can give you an accurate and helpful response.