Tittensor is better known for figures decorated in underglaze colors. Although they are rare, these figures are distinctive for their crude style, which is markedly different from the effect of the enamel-painted figures. Below is a typical Tittensor underglaze figure group. Everything about it is in sharp contrast to the enamel-painted Tittensor figures. Even the bocage flowers are quite different.
Of course, it's possible that Tittensor made both types of figures simultaneoulsy, but I think it more likely that his decorating style evolved to meet market tastes. We shall never know the truth. If you want to know more about Tittensore, please look at Paul Tittensor's site documenting the work of his ancestor.