On the evening of February 5th, Prince Hans-Adam was in England as a guest of the Oxford Union. The Oxford Union website notes the Prince's well-known position on supporting the modern role of royal families, as well as his philanthropy and banking interests as the owner of LGT Banking Group, so it appears that he discussed one or more of these topics with the members. We'll update with more information if it becomes available.
In the meantime, a Twitter photo below, as well as some nice Facebook photos here.
HSH Prince Hans-Adam II of Liechtenstein in discussion with several members of the Oxford Union right now. pic.twitter.com/sPgL5fpaOC— Oxford Union (@OxfordUnion) February 5, 2016