Hi Philip. I have the same issue reported by one of my customer but only with a old MX100.
other clients with MX250 and also running v17.10.4 seems not impacted.
I'm currently onsite of the disturbed client, and I faced the issue by typing maps.google.com in my Edge browser, and notice the small i icon in the bar mentionning this site is not secured since not https.
I just add https in the url, then it works, and when I retry typing without https, then the redirect appears automatically (like in browser cache).
but indeed in v16 of MX100, it was never the case! What happened ?
is there a bug opened on Cisco Meraki for this ?