Re: Would someone explain
Yeah in the UK it's not only acceptable to complete the maneuver after the lights have turned red, it's actually very commonly necessary when turning right.
If you are turning right and blocked by oncoming traffic it is acceptable to enter the junction and wait there for it to be clear. At many lights, that won't happen until the oncoming traffic gets a red, at the same time as you get a red. So you complete the maneuver then. I did this many times in my driving lessons and have always considered it to be quite normal.