TheDE is correct. You only stop at junctions that have a Stop sign.
At Give Way junctions you do proper observations, and depending on what you see, you either stop or proceed at a suitable speed such that everything is under control.
If it's clear for you to proceed at a Give Way junction and you've properly observed that it's clear to proceed, it would be a driving fault if you stopped. Especially if there was a vehicle behind you.
In answer to the "what if a car came from your right?" question: if a car was coming from your right, you'd have seen it and you'd have stopped and waited for a safe gap before proceeding. In the event that you proceeded you did so because no car was coming from the right and there was no chance that a car was coming from the right because you did proper observations.