Economic downturns are when good companies become great ones, and are also the best time to invest, according to Mike Lynch, the founder of UK software firm Autonomy and AI-centric tech VC firm Invoke Capital. While at home on his farm in Suffolk, the entrepreneur, who turns 55 this month, has been taking calls from tech founders seeking advice.  He’s also keeping an eye on calves and lambs being born in its green fields, which are not unlike those of Tipperary, from where his mother, a nurse, hailed. He recalls many childhood summers spent in Carrick-on-Suir. The family lived in…