What's the difference between the echo and the dot apart from size?
None. The Echo has the much better speaker, the dot has a small inbuilt speaker which is Ok for listening to speech and low volume music, but won't rock the house. That said, you can still plug an external speaker into dot.
How do you add stuff to your shopping? Do you just say "Alexa, add milk to Tesco list for Friday"?
Kind of. 'Alexa, add milk to my shopping list'. If you then go into the lists section of the alexa app on your phone it's there, or you can say 'Alexa, whats on my shopping list' and she'll recite it. I found this very useful indeed. In a house with 4 adults (2 grown up kids) people rarely tell me when they need things, now they just add it to the list and when I sit down to do the online shop on a wednesday night I can see what everyone needs. (this includes idiot grown DS's who add 12" dildo's to the list for a laugh)
How easy is it for kids to missuse? If my son shouts, "Alexa, Postman Pat", would it do anything?
I've just tried that and simply, nothing happened. She just closed down. You need to make sure you have the automatic ordering turned off so they can't say 'Alexa, chocolate!' and order box loads directly from Amazon, but other than that she's quite safe.
We did try and get her to swear, she bleeps herself out 😂