Answer:
5"9
the answer above me said 5.9 which is way off, peter is about 5,5 to 5,6 inches tall he shorter than Ant and Dec who are about 5,7 to 5,9 inches tall.
If you don't know, don't answer. I recently met him and he is actually 5.9 - 5.10. I am 5.11 and he was only an inch or two shorter. He may have been 5.7 when he was 13!