Name: Bill Onwusah

From: Leyton, London

How long have you been collecting? 3 1/2 years

How many pins do you own? 800

I suppose that it's a bit of a cliche, but my favourite relates to the very first pin that I collected because it wasn't really even mine at all. It actually belonged to my son who, when he was in year 6, he won a debate at school about whether we should host the Olympics.

His prize was to join something called the Construction Crew. Along with pupils from the host boroughs they were to witness the development of the Olympic site from its very early days.

Along the way, they met various famous people from Prime Ministers and London Mayors to Olympic gold medal holders like Jonathan Edwards and gold medal winners that were running the bid, and Lord Coe.

After one of the initial meetings they were given pins and what was that pin? It was the Builder's Hat, pin number ODA0001 that after much negotiation became my very first pin London Olympic pin.

Incidentally, he said that we should host the Olympics.