Obviously, anyone seeking to get revenge on British Jews for the actions of the Israeli government is a complete idiot, and anyone committing such a hate crime should be punished to the full extent of the law. But as we saw from the Glen Jenvey saga, perhaps such incidents are not as widespread as it's often claimed.
In 2007-08, police recorded 4,823 racially or religiously motivated crimes in which somebody was injured, 4,320 crimes without injury, and 26,495 cases of of [sic] harassment.
There were also 4,005 cases of criminal damage related to hate crimes.
The typical hate offender is a young white male (most homophobic offenders are aged 16-20, and most race hate offenders under 30).