This seems like the best option. Get them into SIPP, sell and buy shares in something you see growing. Ask your SIPP provider how this can be done.
I've asked them about it.
"I can confirm that it is not possible to deposit shares (in the form of a share certificate) directly into a SIPP."
@hippy started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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This seems like the best option. Get them into SIPP, sell and buy shares in something you see growing. Ask your SIPP provider how this can be done.