Write the words of this act the way you think they should read. Solon shows your change as a redline against the published text and pins it to that exact text, so it can never be applied to wording you did not see.
Change 1
As published
9 Official mark to be evidence of amount of postage
The official mark of any sum on any postal packet as due to the Post Office, British, colonial, or foreign, in respect of that packet, shall in every British court, whether within or without the United Kingdom, be received as evidence of the liability of the packet to the sum so marked, and the sum shall be recoverable in any such court as postage due to His Majesty.
Your change, as a redline
9 Official mark to be evidence of amount of postage
The official mark of any sum on any postal packet as due to the Post Office, British, colonial, or foreign, in respect of that packet, shall in every British court, whether within or without the United Kingdom, be received as evidence of the liability of the packet to the sum so marked, and the sum shall be recoverable in any such court as postage due to His Majesty.
One line that says what changes, such as "Halve the dog tax".
Who it helps, what it costs, what it fixes. It is what persuades people to support it.
A proposal here is not law. Support on Solon is evidence that people want the change; the official route says what it takes to make it law.
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Ask what your change would do, who would gain and who would bear a cost, and where something like it is already law. The assistant reads your draft as it stands, cites the law and the studies it finds, and takes no side. What you file stays yours.