As mentioned, much of the aid has been in training.
Which has been accounted for. And realistically speaking training soldiers is not going to cost several bns that have been hidden away.
and they are not the only nuclear state in Europe.
But they are they only nuclear state with which there are serious talks about sharing the nuclear umbrella.
The EU is neither here nor there
The EU is where 90% of the European sanctions against Russia are coordinated. And as it stands now, the prospect of EU membership may be the only somewhat credible security guarantee that is on the table for Ukraine. Matters in which the UK no longer has any say in.
Given that Germany is the largest supplier of aid to Ukraine, set to become the biggest spender on defence in Europe in the next few years and is already stepping up in deterring Russia in Eastern Europe, that is hardly unlikely.
Certainly less unlikely than a British leadership role.
PS: You picked the statistic that doesn't account for the share of EU funds per country, which is of course misleading. French bilateral support for Ukraine is relatively small, but it provides significantly to it via the EU, which makes it equal to British support.