We, as a family had a surprise family meal, a barbecue for the extended family and then paid for my parents to go on holiday for their 50th but I think that my dad would have been happy just with the holiday!
Do what you want, you are not being selfish - it is your anniversary after all.
If anyone else would like to arrange a party for you, that's a different matter!
So it begins….. Streeting resigns



Congratulations!
