The UK government has not concluded it is not a genocide. But they have serious concerns about the way the war has been fought- I don’t think it would be their position that it’s just “war.”
They already have expressed serious concerns about the way Israel has fought the war in Gaza.
They suspended arms licenses due to clear risk of violations against international law in 2024 -
- UK assessment concludes there is a clear risk certain military exports to Israel might be used in violations of International Humanitarian Law
https://www.gov.uk/government/news/uk-suspends-around-30-arms-export-licences-to-israel-for-use-in-gaza-over-international-humanitarian-law-concerns
This is Lammy’s statement about the obstruction of aid going into Gaza:
“More than 132,000 children under the age of five are at risk of dying from hunger by June of next year.
Madam Deputy Speaker, this is not a natural disaster.
It is a man-made famine, in the twenty-first century.
I am outraged by the Israeli government’s refusal to allow sufficient aid.”
https://www.gov.uk/government/speeches/foreign-secretary-statement-on-the-middle-east
Lammy called Israeli actions in Gaza as “monstrous”
“"We must call this what it is. It is extremism. It is dangerous. It is repellent. It is monstrous and I condemn it in the strongest possible terms."
https://news.sky.com/story/shouts-of-genocide-in-commons-as-david-lammy-denounces-israels-intolerable-actions-in-gaza-13371496
Wes Streeting felt Israel had to answer concerns about genocide:
“Mr Streeting told Times Radio: “When the president of the State of Israel comes to London this week, I think he needs to answer the allegations of war crimes, of ethnic cleansing and of genocide that are being levelled at the government of Israel.
“I think he needs to explain how, when we have seen so much evidence of the atrocities being perpetrated by the Israeli army, how he can possibly claim that the IDF (Israel Defence Forces) is the most moral army in the world.
“I think he should explain that, if it is not the intent of the government of Israel to perpetrate genocide or ethnic cleansing, how on earth does he think his Israeli government is going to achieve its stated aim of clearing Palestinians out of Gaza without the war crimes, without ethnic cleansing, or even without genocide?”
https://www.independent.co.uk/news/uk/home-news/wes-streeting-israel-gaza-keir-starmer-health-secretary-b2822876.html
I agree with you @Twiglets1 that the government will have more information than us- and they are clearly concerned about what Israel has done in Gaza. This has gone beyond fighting a war. Call that what you want.