So you'll soon have created a searchable reference to Zesto and spoiled the whole premise of your post.

Edit: And here it is

Was it a regional product in the same way the Irn Bru was for many years?. It's not one that I recall tickling my tastebuds in the north west of England.
I have to say that I can't imagine that the idea of a Tizer / cola combo would have appealed to me.

It sounds like Moray Cup, a fizzy delicacy found only in the North East:

http://www.mb.com.ph/node/261823/h

the most compellingly undrinkable beverage ever.

Searched "zesto fizzy drink" and a woman talks about drinking it. Yes! Now know I am not going mad/senile. Much. Of course the the States you can buy peanut fizzy drink. Peanut! Then again the top three fizzy drinks are:

3: Root Beer

2. Cherry-ade

1. Cream Soda.

Bubbling Under: Lime-ade, Zesto.

Try finding any reference to Maine guitar and PA amplifiers. I had one in the 70s until recently, and the only reference on the net to these find British amps, other than the odd advert, is this very site where I referred to it once. Otherwise they seem to have vanished into thin air. Made in Watford too!

http://www.britishsoftdrinks.com/.
When travelling around the UK with the mighty Vale,i remember R Whites only in London.Maybe Zesto was a regional thing,are you from that part of the World,Bodhisattva?
I remember going into a shop in London and asking for Vimto and the bloke thought it was a new version of Vim scouring powder and told me to try the hardware shop.
Our Pop came from The Alpine pop Lorry which came round our way every Wednesday lunchtime. It would park up by the school and some herberts would run over and Steal a crate as it was an open back lorry.
Who else remembers trying to get pissed on Shandy Bass or Lager and Lime soft drink. ?

find me a torrent of Yes' very first album

according to http://www.glias.org.uk/news/165news.html.

"[...]Rawlings used to make a 'Zesto' orangeade"

though glad that web has at least allowed me to confirm I wasn't imagining it ...see http://www.wordmagazine.co.uk/content/rising-childrens-tv-bait#comment-2... , the description I was quoting sounds irrresistable to me:

Even the basic list of artistes who appeared on the show makes for fascinating reading, featuring such evocative and long-forgotten names as The Tumblairs, The Skating Meteors, and The Breathtaking Eddy Limbo and “Pat”. A handful of more established acts would also show up including conjuring legend Ali Bongo; veteran brother and sister variety performers Johnny and Suma Lamonte, whose acrobatic skills saw them in regular demand as guest turns on light entertainment shows; visiting American Phil Enos and his Amazing Comedy Car; and popular illusionist and judo expert Geoff Ray, who though now retired still proudly includes Zokko! on his CV.Most notorious however were Arthur Scott and his Performing Seals, who left the tiny studio reeking so strongly of fish recording was disrupted for days afterwards.

...but as kids, we used to be thrilled beyond words* at the bright green Cream Soda when we visited the grandparents in Liverpool.

* but it was probably the additives

Hi Bodhisattva

I, too, over the past 5 years have tried to find ZESTO on the web.
Until I was directed to this site I have also had no luck.

I lived in Kidderminster as a boy in the 1950's and my dad used to bring bottles of White's Zesto and Cream Soda home after work in the carpet factory .

I would love to taste them again. Do Britvic who own the R White's rights still have the recipe?

Can you remember the glass bottle and the black screw in stopper?