My husband is a doctor. In a very similar role to her. I can confirm they have family money as this first class travel malarky isn’t cheap. Yes airmiles and you can build them up but she would have needed to be doing alot of flying to build it back up again. Just admit you have abit of money from family as opposed to making out it’s because you are out there saving life’s.
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Also she’s not travelling with her other children because she can’t cope with them. When do you ever see her just being a mum to her kids , on her own with them doing normal mum stuff without it being a massive drama. Never.