Hosts who welcome you to their countries and workplaces are usually doing this to help you; it's not normally part of their job description. You can repay this kindness by being friendly, flexible and punctual, and respect the culture of the country and the customs of the host. You are an ambassador for UK nursing and they will remember what you have said and done for a long time.
Consider taking small gifts to give to the people who help you during your placement. This could include postcards or brochures about the area of the UK where you are a student, literature about your university and lightweight gifts such as key rings, bookmarks, tea towels, paper, writing pens and pencils.
Appropriate textbooks or learning aids would be a special and lasting gift as a memory of your visit.
When writing to thank your hosts after your visit, include a copy of your report and photographs you may have taken during your visit.