Thanks for looking at this. As you reported it working, I ran it again and discovered if I left it, after 30 seconds or thereabouts the second WebView changed its page. Since then it has changed immediately. The same thing, although with a longer delay occured on my Samsung S4 Mini phone. (Original testing was with a Samsung Galaxy Tab S)
I must admit to being impatient and never left it 30 seconds without shutting down and trying something else when I was testing yesterday.
Erel, thanks for your comments. I should have thought of CallSubDelayed.