No, Jolan, I definitely did *not* write as you wrote!
There is a huge difference between a headline of five or seven words:
No solutions before 5 pm, please
and something like 18 or 19:
It’s been suggested that solutions are withheld till 5 pm BST (GMT+1) to allow others to have a go.
I set out to make it short! Second, I deliberately put it in bold to highlight the difference in visibility.
The eye tends to skip to the clues, and to be honest, I would scarcely "see" the long sentence even if underlined.
My suggestions are constructive and meant to be helpful.
I also meant to add that even if people do continue to solve it before time, it is still worth doing for the pleasure you get out of doing it and you still get to see whether people can solve them.