Plastic foam pumps are popular primarily because of their ability to dispense products in the form of foam rather than liquid. The foam provides several benefits, such as improved product coverage, reduced product wastage, and better user experience. Foam pumps are commonly used for hand soaps, shampoos, body washes, and other liquid products that can be transformed into foam.
In terms of trends, there has been an increasing focus on sustainability and eco-friendliness in recent years. Many foam pump manufacturers are developing eco-friendly solutions, such as pumps that use less plastic, are recyclable, or can be refilled. Additionally, there is a growing demand for foam pumps with improved functionality and user-friendly designs, such as easy-to-use dispensing mechanisms and customizable foam densities.

Please note that trends may have evolved since my knowledge cutoff date, and it's always a good idea to consult up-to-date sources or market research reports for the latest information on foam pump trends in the UK and Europe.