Single and double yellow lines indicate that parking restrictions are in place and no waiting is allowed.
You can't park on single yellow lines during the hours of control. For single yellow lines in Westminster controlled hours are generally 0830 to 1830 Mon to Fri or Mon to Sat, although specific times vary by location.
Outside of these times you can park unless there are kerb markings. The hours of control are displayed on large signs as you enter each controlled parking zone (CPZ) or will be displayed on kerbside plates if they vary from the CPZ.
Single yellow marks on the kerb indicate there is a loading ban during certain times as displayed on the nearby street sign. Always check the times on the sign.
Different loading and unloading rules apply depending on the type of vehicle.