Patrick Murphy is back in London.  The Co Louth native has spent years in California investing in tech firms but has relocated back to Europe as his venture-capital firm launches a third fund to back repeat founders and opens a new flagship office in the British capital. The new fund, worth $80 million (€70 million), counts the state-owned British Business Bank (BBB), UK pension fund Railpen, and listed investor Molten Ventures among its backers. The BBB is a new investor with Tapestry and has made a $40 million commitment. Since the firm was founded in 2018, under its former moniker…