The population of Gibraltar is under 30,000. What if, at some point during tensions between the UK and Spain, the British decide to just evacuate Gibraltar's civilian population and find new homes for them in the British Isles, while keeping the military base. There would still be transient military personnel and civilian workers, just no permanent civilian presence. The two likely times for this would be the 1930s and the late 1960s/ early 1970s. Is this POD of no consequence except to the households immediately affected?