Then you might have to explain to the CAA why you continued your flight in IMC conditions without declaring an emergency, or doing something else that's sensible.
After all, if you can't legally maintain VMC conditions, you're IMC.
Obviously, in the example, good airmanship should prevail and a diversion made / 180 turn / head home - but curious given a situation where the weather turned extremely quickly and the sensible thing was to maintain VMC by dropping to 400ft for a couple of minutes.
Would a polite heads up to ATC in flight help your case if a complaint was made?