This was made before the current events. But its certainly interesting and people might should look into the jewish terror groups like Irgun that conducted bombings wich killed countless arabs and a lot of british policemen and governement officials in Palestine.
https://en.wikipedia.org/wiki/List_of_Irgun_attacks
https://en.wikipedia.org/wiki/Irgun
Keep in mind that this is wikipedia, meaning there is probably even more real negative information about that kind of thing. (wikipedia is not to be fully trusted. But this beiing there shows, that this is such a hard fact, that even they cant sweep it under the rug.)
Furthermore there are many Israeli officials, like the former defenese minister who brag about their parents/grandparents beiing in terrorgroups like irgun.
I would ask the british one thing. How in the world can you support a state wich brags about conducting terrorist attacks against YOU in the past?!