"Did you forget something?" the guards asked.

Thousands of tons of the food, medical aid and humanitarian supplies that they need are sitting only a few miles away, on the other side of the border in Egypt.In London I asked Mr Lazzarini whether he agreed with those who have accused Israel of denying food and humanitarian aid to civilians as a weapon of war.

"I have absolutely no doubt," he said, "that this is what we have witnessed during this last 19 months, especially during this last two months. That's a war crime. The quantification will come from the ICJ [International Court of Justice] not from me, but what I can say, what we see, what we observe, food and humanitarian assistance is indeed being used to meet the political or military objective in the context of Gaza."I asked Mr Lazzarini whether the blockade, on top of a year and half of war and destruction, might amount to genocide. That is the accusation against Israel levelled by South Africa and other states at the ICJ in The Hague."Listen, by any account, the destruction is massive. The number of people who have been killed is huge and certainly underestimated. We have seen the systematic destruction also of a school, of a health centre. People have been constant pinballs within Gaza, moving all the time. So there is absolutely no doubt that we are talking about massive atrocities. Genocide? It could end up to genocide. There are many elements which could go in this direction."

Israel's defence minister Israel Katz has made no secret of Israel's tactics. Last month Katz said that the blockade was a "main pressure lever" to secure victory over Hamas and to get the all the hostages out. The National Security Minister Itamar Ben-Gvir agreed. He wrote that: "The cessation of humanitarian aid is one of the main levers of pressure on Hamas. The return of aid to Gaza before Hamas gets on its knees and releases all of our hostages would be a historic mistake."Netanyahu's plans for another offensive, and the remarks made by Katz, Ben-Gvir and others, horrified Israeli families with hostages still inside Gaza. The Hostages and Missing Families Forum which represents many of them, said minister Katz was pushing an "illusion... Israel is choosing to seize territory before the hostages."

Dissident Israeli military reservists also protested, saying that they were being forced to fight again not for Israeli security but for the political survival of the Israeli government. In the air force reserve, 1,200 pilots signed an open letter saying that prolonging the war served mainly "political and personal interests and not security ones". Netanyahu blamed a small group of "bad apples" for the open letter.

For many months Netanyahu and his government have also accused Mr Lazzarini of lying. One official report posted online in January of this year was headed "Dismantling Unrwa Chief Lazzarini's Falsehoods". It claimed that he had "consistently made false statements which have profoundly misinformed the public debate on this issue". Unrwa, Israel says, has been infiltrated and exploited by Hamas to an unprecedented degree. It says some Unrwa employees took part in the attacks of 7 October..

Starting out on Radio 5 Live "was all part of the learning process"."I managed to stumble my way through it, and I learned from really good people alongside me who were incredibly helpful in the early days."

Lineker built on that experience,and carving out a role for himself.