"Will it make any difference?" At least it will be a reminder that Israel's violations of trade agreements with the EU don't go by unnoticed ... "Those who boycott Israeli products on principle, will continue." To boycott or not to boycott is up to the individual consumer. And a prerequisite for his decision is correct labeling.
About 2,000 demonstrators protest 'occupation policy and fascist settlers' in Nazareth (Haaretz)
from the article: U.K. government urges businesses: Label products from settlements