Britain's most ingenious solution for handling terrorism in Palestine was revealed in Geneva last week to the League of Nations Permanent Mandates Commission by His Majesty's Government's Deputy Permanent Under-Secretary for Colonies, Sir John Shuckburgh. Following a suggestion of mail-fisted Sir Charles Tegart, now adviser to the Palestine Government on the suppression of terrorism, a barbed wire barrier to keep out terrorists is being strung along the entire Palestine frontier at a cost of $450,000. This includes a nine-foot barbed wire fence between Palestine and French-mandated Lebanon and Syria, which border Palestine on the north and northeast. A lot of Palestine's tougher Arabs come from those two mandates. The fence will be completed in August, announced Sir John. Almost as he spoke, a band of Arab terrorists swooped down on a section of the fence, dubbed Tegart's Wall, ripped it up and carted it across the frontier into Lebanon.