Interior crack inside yixing lid
i think your options may be to either roll the dice and keep using it or use it as a decoration only.
i'd just keep using it for tea.
i'd just keep using it for tea.
Ahh thanks for the advice, honestly I was just going to keep using it anyways! Unfortunately I bought it at a shop on holiday in Hong Kong and I don't have any real way to contact them anymore. I'm guessing I shouldn't preheat with boiling water then 

The crack in his pot is more severe and extensive. I think it is likely to separate whereas yours is likely to remain the same.
Hopefully OP did not spend too much on this defective modern teapot.
You may try to stabilize it with Permabond, a FDA & EU approved food safe adhesive but it does contain BPA as apparently all epoxies and cyanoacrylates do, including ones used in dentistry.
http://permabond.com/resource-center/fo ... -bisphenol
Another option is to kintsugi it yourself with a kit using the included natural plant polymer. Sending it out for kintsugi would cost as much or more than the teapot cost you.