LONDON (Reuters) - British Prime Minister Theresa May raised concerns about illegal settlements on Thursday at a meeting with her Israeli counterpart Benjamin Netanyahu in London, May s office said.  They discussed the need to overcome obstacles to peace, with the prime minister noting our grave concerns about illegal settlements,  a spokesman from May s office said in a statement.   The prime ministers also discussed the fact settlements are not the only obstacle and that the people of Israel deserve to live free from the scourge of terrorism and anti-Semitic incitement.  