You can't say one has little / no influence and then mention to another poster that Israelis looking to deliver aid (but being prevented) is an empty gesture.
Again - the UK is militarily aligned with the US and Israel. That's as close to a 2nd ally as one can get. We're the only European country that is carrying out reconnaissance missions for Israel. We're the only European country bombing the Houthis in the Red Sea. Our PM is currently demonising peaceful Palestinian protests, and has designated 'Free Palestine', 'From the river to the sea' and other sayings as antisemitic. Our leader of the opposition, who is leading a traditionally socialist and left leaning party, is coming out with pro-Israeli rhetoric. (Despite continuously being on the wrong side of history, Germany hasn't militarily provided any aid or joint operations with or for Israel). To distil allyship as only on sales exports is inaccurate and a misleading thing to say. Whilst we haven't voted against any UN Security Council resolutions for a ceasefire, we've continuously abstained. The only nation out of 15 to have perpetually abstained from any ceasefire notions. We're not quite as pathetic as the US, but we're not far behind.
As said in my previous post, whilst I agree that geo-politically, the UK is pretty impotent (as much of Europe is), one can't deny that Keir has some influence, and if he had come out with calls for a ceasefire from the off, or not even said Israel is right to withhold water, food and aid, it would have some influence on the situation, no matter how small. That's the point you're missing.