Re: Have i missed something?
Your wifi router configured for DHCP? Bet your connected fridge is too. As an uber-basic precaution I use MAC filtering, some MACs are completely blocked, some have permitted times of internet access (kid's laptops and mobes for example - 7pm-10pm weeknights) A fridge MAC would be easy enuf - but I bet they will all be on IPv6. Shame I only run IPv4.
Wireshark is your friend!