Any crime that is racially motivated, and dealt with in a court, is flagged and followed through the justice system. It's astonishing to see just how many anti-Muslim crimes get prosecuted. The perpetrators are usually white Brirish young men. Fewer crimes against Jewish people seem to get prosecuted, most likely because there have been fewer, not because they haven't been reported. Extremist groups are not common - the crimes are usually individual, or an affray where drunken youths have taunted someone recognisably different because of their skin colour or dress.
This new spate of violent protest about Israelis in Gaza is sickening, and I would be interested to know what information comes out during prosecutions. There are racists who will jump on any bandwagon and use riots or protests to enable them to express their hatred of other races. I have met convicted racists who have made both anti-Semitic and anti-Muslim comments indiscriminately. Challenging them can be an intimidating experience. They don't use logic or reason, don't necessarily know anything about the protest they join or the background to it. I hope the ones who are currently causing trouble are rounded up and dealt with at court - the public need to know they are bigoted and lacking in understanding, not people with inside knowledge.