#⃣#⃣ Update #⃣#⃣ iOS 9.3.1 has resolved all my issues hurrah!
Crazy weird.
And I can confirm it all seemed to kick off about a week after the 9.3 iOS upgrade. I updated 4 devices successfully.
Strangely enough, it does not affect my iPhones 5 and 5S at all. I own all apps concerned; Booking.com, WhatsApp, Twitter, Wikipedia etc
But my iPhone 4S and my iPad 3 are adversely affected; hyperlinks fail and freeze the app in Mail, Safari, Outlook. However, my 3rd party browsers (iCabMobile, Dolphin) are not affected, and Yahoo Mail as well as Gmail are also unaffected. I tried the Airplane Mode / iTunes / App delete and reinstall hack once on my iPhone 4S and it didn't work, so I haven't bothered to try it on my iPad 3 (too many songs to sync, tedious and lengthy process ;-( ). The Javascript toggle is also ISDN (In Short, Does Nothing!).
Crazy weird...