If you haven't already, please report this to the MET. It's possible that nothing is wrong but due to the age of the child and the fact you found it strange it's worth a report even if it just goes down as intel. You can report it here https://www.met.police.uk/contact/af/contact-us/contact-us-to-discuss-something-else/ Try to be as descriptive as possible, if you can't remember any aspect skip it... 1. skin colour 2. sex 3. age 4. height - use between heights or ?about 5?8? rather than a precise height 5. build 6. hairstyle and colour 7. complexion 8. distinguishing features, eg tattoos, scars, beard, etc and include if they wore spectacles 9. clothing (from top to bottom) 10. carrying anything. 11. Accent