Educational Psychology Doctorate 2018 - International Student

Hi,

I am considering applying for a doctorate in educational psychology this year, but I'm not entirely sure if my experience level would suffice, because I just about meet the requirements and have heard about the competition to get on.

I have a double bachelors degree (part of a 4-year joint program) in Psychology which is approved by the BPS.
I interned at 2 mental hospitals assisting clinical psychologists, the first for a month working mostly with adults and some children, and the second for less than a month working with children only.
I have interned at a special needs school for 1 month as a Teacher Assistant and Counselor.
I am currently working as a full-time Primary School Counselor at an international school and would have completed 1 year at the time of application.
I have also been a part time Psychology tutor to high school students for about 1.5 years.

I am wondering if it would be realistic to apply at this point or should I wait until next year. Also, does having a master's degree greatly improve your chances?
Also, I know the training is mostly for UK students, so if anyone could share information about international students' places on the course that would be very helpful.

Thank you!