bellis,
You create your design at your shop or where ever and take it ready made to the show.
Then you stage it (or plonk it on the table!)
The judges start @ 7am on the Wednesday and results are known about 11ish...
you get a schedule on the classes and then it’s your interpretation that’s judged.

The North of England Horticultural Society harrogate spring show, it has plant's and flowers and other things there, so a bit like the one you mentioned.
Harrogate Flower Shows
Hope this link works!!!!
There is a picture of what I did last year in the gallery, the sweetie one..

Chelsea is bigger but I cannot enter as I have not the relevant qualifications!!! and im going to have to do some Research in to the other comps around england...unless some one knows of any?

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