Ladybird & Jean Adamson 
Ladybird Readers Level 1 – Topsy and Tim – Go to London (ELT Graded Reader) 

Topsy and Tim are going to London with Mommy and Dad. They see the Tower of London and go on a boat. London is great!
Ladybird Readers is a graded reading series of traditional tales, popular characters, modern stories, and non-fiction, written for young learners of English as a foreign or second language.
Beautifully illustrated and carefully written, the series combines the best of Ladybird content with the structured language progression that will help children develop their reading, writing, speaking, listening and critical thinking skills.
The five levels of Readers and Activity Books follow the CEFR framework and include language activities that provide preparation for the Cambridge English: Young Learners (YLE) Starters, Movers and Flyers exams.
Topsy and Tim: Go to London, a Level 1 Reader, is Pre-A1 in the CEFR framework and supports YLE Starters exams. Short sentences contain a maximum of two clauses, using the present tense and some simple adjectives.