We had to organise it ourselves. It's a way to build confidence for future employment. It's not hard. And 15 year olds are hardly babies. When we did ours we were told to call multiple places in case something fell through or to ensure we actually got a place.

Work experience isn't just about getting a place in your chosen field, it's about experiencing work. The whole package. A lot of people in my year never got to work in their chosen fields. Usually only those with contacts got that luxury.
Totally agree - as someone who has work experience students usually twice yearly, I treat them in many respects like a paid staff member - in that they are expected to arrive on time, call themselves if they are unable to attend and participate in the workplace like any other staff member.
We had a young man who came and did his first week of WE with us as he was only able to attend his chosen field for the second week. Childcare was not his career aim, but he was wonderful just the same and both he and the centre benefited greatly from his time with us.