'70s in Spain, Fanta was popular but Coke was their “poor sister”, to the point where many small-town bars had Fantas (or Mirindas, their biggest competition) but not Coke or Pepsi. More cosmopolitan areas were more likely to have “black” sodas, and the default soda was gaseosa, with La Casera as the brand you could find anywhere and other brands being sold only locally.
I had some a few months ago and it was almost like fruit punch. However, that is not how I remember it being when I was a kid (and when it was a lot more widely sold than it seems to be now). Maybe it is just my memory playing tricks, but, as I remember it, back then it had a drier, more bitter flavour combined with the fruityness. Also, it now seems to be red in colour, whereas the Tizer I remember was a sort of deep reddish orange (though nothing like the orange or actual oranges, or orange pop).
In the UK in the late 70s/very early 80s my parents used to get carbonated drinks, in glass bottles, delivered much like milk was. From what I remember we didn’t get any form of cola. We moved from that house in 1982 (I was born in 1974) by which time my mother had stopped ordering as she’d had some weird dispute with the delivery guy.
I can’t for the life of me remember the name of the make.
Oh and this was a small town - it wasn’t a big city thing.
Corona!
This isn’t unusual: most pop formulas changed (and not for the better) back in the ‘70s when they about doubled the sugar content. This may have had something to do with Westerners’ sucrose addiction (read Sugar Blues by William Dufty sometime), or with the switchover to high-fructose corn syrup, or probably with both.
I remember the Seven-Up of my childhood having a smooth, almost creamy taste, rather than the sharp citrus bite it has today. It was the only brand of soda pop my dad ever kept at home.
Covert marketing with respect to…? 
They’ve been playing about with the recipe. How long ago were you “a kid”? There have been non-trad-Tizer Tizers since 1995. Maybe you were more used to one of those?
Edit:
Just re-read the thread and saw that you were a kid in the 50s/60s. Ignore me … 
There was a mid-1980s movie called The Coca Cola Kid, which involved a hotshot marketing executive trying to figure out why people in a small area in Australia weren’t drinking Coke.
Unfortunately all I can remember about the film after all these years is the luscious and adorable Greta Scacchi.
Not in the right time period, but… One, Two, Three is a comedy with Jimmy Cagney as Coca Cola’s chief salesman in Berlin.
Actually, that’s exactly what I was thinking of when I mentioned regional brands, earlier. I’ve only ever seen that ad on those nostalgia TV programmes – it was never broadcast here in the North East, because R White’s lemonade wasn’t sold here.
It may have been, but other companies delivered, too. We had pop delivered by two different companies when I was a kid: one was the Co-op, and the other I can’t remember, but I don’t think it was Corona.
Alpine, Dunns, Garvies all delivered to the door in Glasgow
I believe Scotland, with their Irn Bru, is the only country where the local carbonated soft drink sells more than either coke or pepsi.
Don’t care for it myself but tastes more like cream soda than anything else to me.
True and it was recognised in the Irn Bru ad - Barrs Irn Bru - your other National Drink
the history of Iron Brew or Irn Bru
Sweden has a seasonal thing like that. For eleven months of the year it is all about Coke, but then come December everyone switches to a local carbonated beverage called Julmust. I am told that there is significant opposition to Coke come December time due to marketing strategies the Coca Cola company has used to try and beat Julmust, but frankly I can’t remember much about that.
As a half-Scot, I love Irn Bru. Always a joy to get hold of some of that when I go back to the UK (although I can buy it in a single import shop in Stockholm …)
Got a bottle on my desk now 
I hate you.
Mind you I do drink a lot of it - approx 3 ltrs a day love the stuff - Hate/Love - fine line
I think Inca Kola still outsells Coca Cola in Peru, although as they’re at least part owned by Coca Cola I’m not sure it counts.
Coincidentally, Inca Kola isn’t really a cola type drink - to me it seems very similar in flavour to Irn Bru, except bright yellow rather than bright orange…
OB
(*) Count me out, please!
Julmust and påskmust (the same stuff sold at Easter) is a vile misuse of malted barley that could have been used to make a good beer. My opinion about people drinking the stuff is that they do it out of tradition, totally disregarding whatever qualities it has (or has not).
I have tasted it once and I must quote what a German colleague said about cloudberries: “I leave it to those that understand how to appreciate it”.