Netflix is now available in the UK, and that means it's now available for iPhone and iPad in the UK App Store (and Android too). One month of service will run you £5.99 which isn't too far off the US or Canadian prices.
Content is... content. It sounds like it's okay at launch but stuff will come, stuff will go, so if you see something you like, start watching it now.
It's a universal binary, so if you're in the UK and you try it out, let us know how it works for you.