the reports say Britain sold arms to Syria - show they didn't.

You have provided no "report" or anything else suggesting Britain supplied Syria with one single weapon.
That is because Britain has supplied no single weapon to Syria, while Russia and China have provided thousands of tons of them.

If you are not a fantasist liar Jim, tell us why you believe Britain HAS supplied weapons.
Supplementary question for you.
Should the appalling, repressive regime in Gaza be prevented from obtaining weapons?