just like my soror said,
going to england is a once in a life time thing. whatever sorority it is can wait!
and think of all the experience u will gain!
but if it is truly in your heart to be in a sorority, it will happen. a lot of undergrads tend to think that being in a grad means u miss out on all of the "undergrad activities of being in a sorority" i am here to let u know that may not be the case.
i did become a member as an undergrad, but working with the grad chapter is a little different (more work!)
but i am on the advisory board for the undergrad and i help with all the functions. i even step with them!
so u will not miss out on much if u choose to go grad chapter and if it means a lot to u then the wait won't kill u
have fun in whatever u do