I couldn't work out why on my Stripe (UK) account, Plans were not Syncing. I then discovered the following in the Stripe logs:
Despite selecting United Kingdom in settings, it has not updated the Currency Code to GBP.
Stripes UK system is exactly the same as the US system with the exception it deals in GBP rather than USD. I am lucky enough to be one of the early adopters and it's about to go BIG in the UK soon.
Is it possible you could update the code sometime soon? In the meantime anyone know where I need to go to change USD to GBP in the code as a stop gap solution?