A Splendidly British Solution

According to information available on the GOV.UK website: (https://www.gov.uk/waiting-and-parking/waiting-and-parking-238) 

You MUST NOT wait or park on yellow lines during the times of operation shown on nearby time plates (or zone entry signs if in a Controlled Parking Zone) – download ‘Traffic signs’ (PDF, 486KB) and ‘Road markings’ (PDF, 731KB). Double yellow lines indicate a prohibition of waiting at any time even if there are no upright signs. You MUST NOT wait or park, or stop to set down and pick up passengers, on school entrance markings (download ‘Road markings’ (PDF, 731KB)) when upright signs indicate a prohibition of stopping.

Today we are informed that consideration is being given to a clarification of that "Double yellow lines indicate a prohibition of waiting at any time" instruction - which according to the BBC doesn't actually mean what it says any way, because, say the BBC:-

Parking and waiting on double yellow lines is prohibited - unless stated - for all vehicles except for those making commercial deliveries and pick-ups, blue badge holders and the emergency services.

by having a new regulation which says that during the hours that trading establishments are open anyone may park for up to 15 minutes on double yellow lines outside or near to said trading establishments, with presumably this "you may stop for up to 15 minutes during the following hours" exemption from the "normal rules" being displayed on a sign on an upright immediately below the sign on the upright stating the "no stopping at any time" rule ...  You simply have to laugh, else ...