Cooking Linda McCartney Sausage Rolls

Question for anyone who eats these. I remember a few years ago I used to be able to make the puff pastry rise in the oven which makes them flakier and more tasty. Now when I cook them the pastry barely rises at all. I have tried coating them in just olive oil, just soya milk, just almond milk, or a combination of olive oil/soya milk and nothing seems to work any more. It's a fan assisted oven and I cook them at 200 celcius. Any advice ? Thanks!