Can you ask the person who bought it for you where they got it from? That supplier would be responsible for sending you the missing bolts, if you can contact them.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
If you don't get anywhere with the supplier, you could try somewhere like this https://www.greenhousespares.co.uk/ to see if you can buy compatible bolts, clips etc.
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