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As a shareholder of a fund held offshore, he would surely have had an input in where the fund was held.
True, but how much influence does a mere 30k holding in a fund have? I don't know the size of the fund but that must be a tiny percentage. Probably a lot less sway than just telling his father it probably isn't a good idea.
Given he sold up 4 months before becoming PM he was probably advised to get rid of any offshore holdings in order to look squeaky clean (ha!) from the start, although he managed to fuck the media aspect of this when it was eventually discovered.
As a shareholder of a fund held offshore, he would surely have had an input in where the fund was held.