with IELTS you can get admission in famous and standard universities.
It is also possible that some universities in uk offer their admission without IELTS but most they have not standard knowledge universities so overall I will suggest you that first you must do IELTS in good band before going for admission.
what is the language of instruction in your classes both in Under graduation and schools can you provide full proof documents on that to the University. Some university may consider on that.
But I always recommend to go for IELTS/TOEFL, it is not so hard needs few months preparation only.