Who was Derek?

Derek Malcolm Wicks (died 1959) was adopted by Henry William Wicks and his wife, Caroline Ruth.

This is what I have so far.

26.3.26 Derek was born in London, I believe (I don't have a cert!)

21.06.26 he was issued with an emergency travel document by the British Embassy (Consular Section) in Paris

September 1927 he is on a passenger list with Caroline Ruth - so presumably he was living with the Wicks's by then.

31.08.28 there is an entry for him on the Adopted Children's Register.

Is there any more I can do to find out who he was ? - presumably he was not born with the surname Wicks