I think you can safely assume that the majority of Jewish people in the western world are currently very afraid.
Jewish schools and institutions have needed security for many decades.
Every single day (literally every single day) we are seeing the most disgusting antisemitic abuse online and sometimes in person. Very often, people use the code word 'zionist' in that abuse because they think the REAL problem are the Jews who want to have their own safe country and be left alone to live their lives, same as any other people want.
Surveys show that half of Jewish people have considered leaving the UK due to antisemitism in the past couple of years. So if you do buy this house you may not have Jewish neighbours for more than 10 years or so.
People have a range of views on the details of the war in Gaza but my belief is that the majority of Jews recognise that if Israel did not retaliate at all, there may very soon have been no more Israel and that affects all of us. You will not find many people willing to enter into conversation about it because there is so much misinformation and lies being told and usually the seemingly innocent questions, once answered, uncover pretty antisemtic beliefs.
As for the 'staunchly Israeli couple'......Israel and the Jewish community is extremely close knit, and almost every single person in Israel knew someone murdered or taken hostage on October 7th. People are traumatised and locked into constant vigilince, checking the news constantly, talking about it, fear, anger, processing and reprocessing events. On top of that there is the war, the rise in antisemitism, the ever increasing climate of fear to also be processed. Maybe your friends could consider all of that and realise that their neighbours are likely struggling with PTSD?
Whether or not Jewish neighbours are friendly will depend a lot on a)whether they are ultra-orthodox..the more religiously observant that people are, the more likely they are to keep themselves to themselves. It's not personal.
b) whether they feel you are othering them, or c) asking them if they agree with what's happening in Israel (already quite a leading question in it's tone)
Also, Mumsnet is full of people asking faux innocent innocent questions about things related to Jews, and the war, and they probably ask knowing full well that within 10 posts it will descend into a snakepit of antisemitism. This happens every 3-4 days. Hence suspicion here about your initial post and follow up questions.
If you are looking for safety, an uncomplicated life and neighbours you have common ground with so your kids can play, you might be better off looking for another house. You have the choice to walk away from exposure to antisemitism.