On the first day of term teacher was doing re

On the first day of term teacher was doing registration. Half way through little Jonny walks in.
”Sorry I’m late miss, I’ve been up Primrose Hill”
She carries on with registration when little Jimmy walks in.
”Sorry I’m late miss, I’ve been up Primrose Hill”
She carries on with registration when a new girl walks in late.
Teacher says ”Don’t tell me, you’ve been up Primrose Hill”
”No miss, I am Primrose Hill”