I must admit I don't understand the logistics of getting weapons to Ukraine, but the way I see it is that we seem to be dragging our feet, not only the UK but many many more countries who at the start of this war said and say they are behind Ukraine. The way you show that is to flood them with whatever they need.
To me it is a disgrace at the moment that they are begging us at every opportunity.
Putin threats were, any interference from the west would call for nukes. We have interfered with arms. No action from Putin.
Putin threatened to cut gas off if we didn't meet his demands. We didn't meet his demands, no action from Putin.
All in all lots of threats that really have come to nothing. So far we have called Putin's bluffs.
Putin can't get the better of the Ukrainian forces, and he can do very little regarding sanctions. So he's resorted to having hissy fits on the civilians.
Lets stop pussy footing around with this loser and either go in, or send enough weapons for the Ukrainians to do the job.