By Susie Beever A woman believes she spotted a big cat prowling near empty tennis courts by her home in the Scottish Highlands. Annie Mitchell claims the creature she saw roaming the courts was “bigger than a Labrador”. The 71-year-old was looking out her window at her bird box while having lunch when she saw the “large black cat”. She went out for a closer look and watched as it prowled around the now-closed tennis courts near her home in Kirriemuir in Angus, Scotland, on Monday. Annie said the sighting left her shocked and wondering whether she’d spotted a real life ‘big cat’. She said: “My …