Sentence 1: Robin had an issue with his plumbing. 
 Sentence 3: Although he called a plumber immediately, they didn't come for weeks 
 Sentence 4:  Until they came, Robin had to do all his washing up in the bath 
 Sentence 5:  He found it was much easier to soak all his dishes at once 
 Given Sentence 2: The pipe in the kitchen would leak every time he washed the dishes.