We are not saying that israel cannot defend itself. What we are saying is that Israel cannot buy British weapons and then proceed to use them against the Palestinians in Gaza or the West Bank as per the agreement Israel signed when purchasing the weapons. Israel obviously doesn't have to purchase the head up Displays if it does not wish to do so.
Fire in Jerusalem suburb causes severe air pollution (Haaretz)
from the article: 'British MPs seek review of arms exports to Israel'