Thanks for posting Graham.

I've not actually read it yet, what with it being posted 20-odd minutes ago, but I'll ask what I often ask: Is there any published rationale for these changes? Which is not to say that they're problematic but it's not aways obvious at first glance and a brief explanation would save preparing an argument against what turn out to be quite sensible updates.

What's the difference between the struck out text in blue and the struck out text in red? Random e.g., on p73 line 2193 is an addition, 2250 is a deletion but 2252 is also deleted?

Thanks for posting Graham.

I've not actually read it yet, what with it being posted 20-odd minutes ago, but I'll ask what I often ask: Is there any published rationale for these changes? Which is not to say that they're problematic but it's not aways obvious at first glance and a brief explanation would save preparing an argument against what turn out to be quite sensible updates.

What's the difference between the struck out text in blue and the struck out text in red? Random e.g., on p73 line 2193 is an addition, 2250 is a deletion but 2252 is also deleted?

Jam said:

but I'll ask what I often ask: Is there any published rationale for these changes?

No, that would be very onerous for a document such as this. Changes come from developments in standards and industry guidance,  comments received, and questions asked.

Jam said:

What's the difference between the struck out text in blue and the struck out text in red?

One is in blue, one is in red !
Might sound like a glib answer, but it really is just how the changes (made at different times) come out in the software !

The IET hasn't always provided "tracked change" versions for public comment. At least this way you can see what's changed and decide if you have any comments on that, rather than trying to decipher what's changed first.