Yes, my Aunt had a sweet shop and sold Walls ice cream, and I remember a number of developments while growing up through the 50s and 60s. At that time Lyons Maid was the main competitor. First, everything was in a block - even wafers and cornets were small blocks; Mr Softee and Mr Whippy came later - end of 50s/early 60s?. The choice, as you say, was vanilla or strawberry and vanilla, but there was also chocolate, strawberry and vanilla, known as Neapolitan, which must have come out soon after? I reckon the next initiative was ripple - I think Walls made Raspberry Ripple, and Lyons Strawberry Ripple - again in blocks. There was also a Tutti Fruity - with crystalised fruit in. Lollies changed too, from just a fruit flavour, to the introduction of ice cream in the middle - Walls had a split, but I reckon Lyons Maid beat them to it with the Mivvi. I also remember as a treat eg at Christmas or Birthdays, she would get in an ice cream cake for us