Ok . Simple rules . Yellow lines , whether double or single , painted on the road , are in relation to WAITING restrictions . Not stopping restrictions . This means there can be exemptions which allow you to stop on them , like loading / unloading of goods , boarding or alighting of passengers , emergency vehicles stopping on them , blue badge holders can park on them for example . They are either single or double depending on how long the waiting restriction lasts for . That's all.
LOADING restrictions , for which there are usually two or three yellow stripes painted across the kerb , means that whilst you cannot load or unload during those times , and blue badge holders shouldn't park there , there is still an allowance to board and alight , but it is for a short time only . Loading restrictions don't tend to last as long as waiting restrictions , and will tell you how long they last on the white part of the sign. Yellow part relates to the lines on the road.
Red routes are the ones with no stopping . For any reason . But the times that they are in force for may change , particularly round areas with bays , so the signs should be checked as to when they are in operation , except for Double red lines, which always mean no stopping ever ever ever .
So if the lines were red , they were stopping restrictions , if they were yellow , they're waiting restrictions. Big difference.
Does that help , OP ? No sarcasm implied or intended .