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Close. Just inside the <IFRAME> with a space.

Acorn

<iframe name="newsletters" width=100% height=100% src="https://www.thornton-steward-sailingclub.co.uk/newsletters/sailtime_sep20.htm"...

You're welcome.

The missing setting could just be scrolling = "auto" or scrolling = "yes".
BUT
HTML5 has deprecated 'scrolling' so you may need to replace it with style="overflow: visible;"
...

I definitely would not use a Slider for this.

I set up a set of pages in a Horizontal Supersite with a gap of 5px.
Each page is designed to exactly hold one image. Do not have a page shadow.
I...