Attempted a Yorkshire Pudding as per the recipe on the website for the first time. The result had the texture of a cake rather than a traditional pudding as pictured below. I wonder if this is the expected result or if I did something wrong?
I did deviate from the recipe in a few ways. Firstly I did add the optional yeast (Hovis fast action bread yeast) and I did not add the salt to the mixture straight away but gave the yeast a little time without it first. The second thing was that I made the batter some time before it was needed so the yeast was bubbling away for about an hour first. Have these deviations resulted in more of a Yorkshire cake than a pudding?

It sounds like the deviations you made, especially with the yeast and timing, may have caused the batter to rise more like a bread or cake rather than the traditional Yorkshire pudding texture. The yeast might have caused the batter to rise too much, making it more airy and cake-like.
For a more classic Yorkshire pudding, try skipping the yeast and mixing the batter just before cooking. This will help maintain the expected texture.
By the way, if you’re craving something else while experimenting, you could check out the Jack in the Box menu with calories for some tasty meal options!