Travel / Are kantors in Poland reluctant to exchange Sterling following Brexit? [2]

Hi, I've just joined, travelling to Gdansk for a holiday, I normally exchange money in kantors. However, I've now been warned kantors are reluctant to exchange sterling following Brexit due to large market fluctuations, is this true? I'm looking to exchange @ 2000 sterling, so is it best to cut my losses and change my money before I go? Thanks, Jerry.