It's not too unheard of. Tory MPs Ann Widdecombe and John Gummer converted to Catholicism from Anglicanism in the 1990's. Catholic intellects such as Cardinal John Henry Newman (the original rector of UCD) and Fr. Frederick Copleston (key historian of Philosophy) were also Anglican converts to Catholicism in the 18th and 19th centuries respectively. I don't know any celebrity converts in the other direction but I'm sure there's plenty.
The headlines are a bit misleading. The study says that more Catholics attend mass every weekend than Anglicans attend church. The study says 'Britain', I don't know if that includes Northern Ireland as well. It must also be noted that Catholic attendances are still decreasing just not as steeply as Anglicanism and the decline is arrested by immigrants from Catholic countries with a higher degree of religiousity like Poland.
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