Just carried out your suggestion Theo and still had to log in again after a visit to Google...thanks for joining in Anahata, how would I have put Safari into private or incognito I wonder? More to the point I suppose how do I correct it? No big deal I suppose, it's not exactly wrist breaking, logging in a couple of times a day...
I'd suggest checking....
In iPad Settings...scroll down to Safari , on the right side and hidden (so scroll down on the right) is a section called privacy & security.
There's a setting for "do not track" I'd be inclined to have that off (not green)
And there's another called "Block cookies ", mine is set to "Allow from websites | Visit"
Mine did an update yesterday, so I suppose there's every possibility that everything's changed, but in any case I'd guess your settings for this would be in that sort of area.