3 point turn - Right Of Way

[supersteve939]

Hello, Looking for some advice please.

I frequently perform a 3 point turn outside my home on a quiet residential street.
My question: During the manoeuvre, cars sometimes approach and try to squeeze in front or behind whilst I'm across both lanes.
Who has right of way?

I've been driving 20+ years and I'm sure I remember that the manoeuvring vehicle has right of way.
Am I right in my beliefs or are there certain guide lines to the 3 point turn regarding which vehicles have the right of way?
Thank you for any advice you can give.
Kind regards
Steve