Jeremy doesn't, and I don't, and you don't. The EU has made proposals to tax companies in the countries where they earn their money, to prevent tax dodging by whisking it away to another country. This should clip the wings of the international tax-dodging billionaires who control most of our media.
Theresa dropped Cameron's promise to act on it (see link above), perhaps because she was formerly threatening to be a tax haven for Europe.
Action on tax havens was a commitment in the recent Labour manifesto (see link above).
I see no need for an ordinary pension scheme to use a tax havens.
Every million that a tax dodger squirrels away is a million that the ordinary tax-paying citizens have to cough up instead, to prop up our public services.