Alert them formally, early on, to expect your trial script at such & such a date, and that it’ll take them 15 minutes to check properly.

Get them to diarise this.

I’d also include your best salesperson in this approval team, or your relevant workplace manager or team leader, as the people doing the job always know something you don’t.

Similarly, if you’re the best salesperson, eg, business development director or manager, then let your product manager see the script.

Or if you're the best safety person, speak to the team leader of the team with the least incidents or accidents. Get their input.

This all sounds obvious when you see it here on the page today. But in real life I’ve seen many companies where the left hand isn’t always talking to the right hand.

The outcome in these situations is always the same, ie, someone pops up at the last minute with major changes that trigger a panic., and it happens because they weren't consulted early on. Obviously this isn't a perfect situation. It can even spell cost overruns.

Just don't let it be you. Plan for approvals, and diarise accordingly in a timely manner.