How many calories in this portion of cheesecake?

Had 1.5 pieces of this Oreo cheesecake from Cat and the Fiddle. According to the website, they state "Approximately 12cm / 500g". Would appreciate it if you could give me a rough estimate. Thank you!

Link – https://www.catandthefiddle.com/products/petite-cookies-cream-cheesecake