After making this recipe many, many times, I can attest that the long bake time (about 45 minutes ... frozen – this then took 50 min to cook to golden brown in the oven at the temp you suggested.
Serve drizzled with a little olive oil. Adam’s tip: If you need to join two sheets of puff pastry together, place them overlapping on baking paper, allow to thaw, then crimp the two pieces at the join ...