Where to find a good job for Year 10 work experience relating to engineering or architecture?

Right, I'm in year 10 and I have to find a job for a two week work experience project held by most schools. I want to be an architect or engineer in the future but I can't apply to be one for work experience because I am too young. Anyone have ideas which jobs, relating to science/maths/graphics I can do during June? And where I should apply?

BTW I live in London!

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