It seems like it was competing with Lucozade, as a health drink. Being orange flavoured though, means it would taste nicer than it's more well known rival!
Pola-Cola I do remember. Just as Peter Kay jokes about Rola Cola, us kids sussed it was quite a substandard alternative to the real thing! I'm sure this is the one which had a kind of flowery taste, and went flat dead quick.
Anyway, the Pola-Cola ad is dated 1968.
Both were made by Robertson Fruit Products who were based at 12 Corso Street. Later in the 70's they were taken over by Strathmore Springs.