Dave, Britain fought in two world wars, yes, but I don't know what you mean by 'complicit' - she didn't start them, and you may dislike the fact that Germany lost both of them and Britain didn't but you will find comparatively little support there.
As for the rest it is simply not true.
Britain did not have Palestine n 1917, and did not 'give it to the Zionists' - read the Balfour Agreement - it says nothing of the kind and of course they didn't start the problems in the Middle East.
And why do you maintain they could have saved Europe's Jews from Hitler's concentration camps? how? however much you want to spare the Nazis the guilt of the Holocaust, you cannot do it by lying - Hitler and his regime built and staffed the labour camps, and later the death camps - they built the gas chambers, and Hitler's own SS shovelled the Zyklon B capsules into them to kill the Jews, they gunned them down at Babi Yar, drowned them, starved them at Belsen - and forebade Jewish emigration in 1941.
So how can you possibly support your statement?
Again, however often you repeat a lie you cannot make it true.