Dreams about traveling, especially to new places, often symbolize exploration, personal growth, and new opportunities. Your excitement and happiness suggest a desire for adventure and change in your waking life. Visiting London, a city rich in history and culture, may represent your longing for knowledge and new experiences.

The old, rundown pub could symbolize a connection to your roots or a reflection of the past. It may also indicate that you are seeking authenticity and genuine experiences rather than superficial ones. The incident with the old man vomiting on your leg, while unpleasant, might represent unexpected challenges or discomforts that can arise during new experiences. However, the fact that you still felt excited throughout the dream indicates that you are open to embracing these challenges as part of your journey.

The landlady's apologetic nature and her act of wiping you down can symbolize support and care from others during difficult moments. It suggests that even when faced with setbacks, there are people in your life who are willing to help you.

Overall, this dream encourages you to embrace new experiences and not be deterred by minor setbacks. Consider what new adventures or changes you might want to pursue in your life, and remember that it's okay to encounter challenges along the way.