British fintech bank Monzo has made One Central Plaza on Dame Street the new home for its European headquarters as it continues to invest millions of euros into the expansion of its Irish operation. The London-based business, last valued at £4.5 billion (€5.3 billion) in a secondary share sale in October, is in the process of building out an Irish arm in order to operate within the European Union. The bloc will be its second international market in addition to the US. Monzo first established the Irish holding company MBEU in August. Since then it has made a series of…