WARSAW (Reuters) – Market confidence has increased in Poland following the election of its new government, the prime minister said on Wednesday, adding that he had discussed with his British counterpart Rishi Sunak a possible trip to London. Poland’s zloty has gained around 4% versus the euro since a broad pro-European Union coalition won a majority in an October election. The country’s budget is under strain, however, from costly legacy items as well as expensive campaign promises, and Warsaw plans to do more to tap international markets to cover its borrowing needs. “It seems that the change…