Firstly, I want to make it clear than anyone feeling unsafe simply because they are Jewish is not acceptable - I just want to make that clear first. It is unacceptable that synagogues feel they need security just to have a regular service. This has been happened for years and years. It is unacceptable that people feel they need to avoid places or hide the fact they are Jewish.
However, you are confusing different things here. People have slogans against Zionism because of various actions Israel has taken since the Balfour Agreement, and the fact that they are perceived and often do say they want a 1 state solution. This is the perception of Zionism.
You said "variations probably come doen to how the question is framed and how zionist is defined" and this is exactly right. But more than this - the article referred to 3744 respondents, and that they were "self selecting samples who confirmed their status as residents of the UK. Samples were primarily contacted through seed organisations, including religious bodies, online networks, and community welfare organisations". This is what I meant when I said many Jewish people are unlikely to be polled about this question - because they are not on online groups, or part of seed organisations or religious bodies or community welfare organisations - does that make sense now?
The poll you referred to refers to 3744 people providing their opinions. Yet in the 2021 census, 287,360 people identified as Jewish. You can see the difference. The result of the poll you referred to is therefore misleading. I don't know how many people identify as Zionist or what kind of Zionism they identify with, and I believe that the rest of the article raised important points and I am not suggesting that the survey was without merit, but you really cannot conclude that 8 out of 10 Jewish people are Zionists based on 3744 respondents out of a potential 287,360 respondents.
What you say about Israelis calling for peace and a 2 state solution, I agree with you that this sort of thing is happening as I have seen videos indicating the same, and it is fantastic. But there are other commentators saying that "most" Israelis agree with what Netanyahu is doing and the intention to "wipe out" Iran, Hezbollah and so many Palestinians - I can link the video if you haven't seen it, it is a well known Israeli journalist. This is why there is a problem with perception.
But as I say, fear in the UK just because you are Jewish isn't acceptable.