Ademola Lookman has had a meteoric rise into the Charlton first team. Steve from Petts Wood told me on Saturday that somewhere on the internet there is a copy of a letter from him asking Football League clubs for a trial, but I haven't been able to find it. (Thanks to everyone who has now provided this information, see comments.
He joined Charlton's academy in 2014 after signing from Waterloo FC a youth football club based in the London Borough of Lambeth. His impressive goal scoring record for Charlton's U18 and U21 side led to him making his first team debut for the Addicks at MK Dons.
In this clip he can be seen scoring a screamer for the U18s: Lookman goal