How much wine? Wine has a lowering effect whilst the liver is busy processing the alcohol. This might explain why you were fairly low at 2 hours, and once the alcohol was out of your system, the food started to have an effect.
There is also a lot of fat and carbs in a steak and kidney pud, so the peak could have happened later, similar to the pizza effect.
according to Carbs & Cals
182g steak and kidney pudding
34g carbs
20g protein
20g fat
2g fibre