English accent as known little of the residents in the UK. And there is only one accent is only used in England.
And "Received Pronunciation". Started as an accent to use in the class, well-educated, and reporters as BBC news channel.
In a school or university, it is taught by the accent RP. Whether they have any accent It is taught to use the basic accent
Finally, whether we speak any language We can say without accent. (it is impossible to speak English without an accent, and no one will say "this not English accent.").