Generally old fasioned steaming, hot water towel over the head even without flu like bunged up symptoms its good to clear and moisten those airways and covonia chesty is quite a good I find, but I said the same at my pre op i’ve recently given up smoking but since doing so have developed the worlds loudest chesty cough and I thought they’d think I was not fit for the op but the nurse assured me as long as you dont have any fever like syptoms (temp hot and cold flushes etc) then all would be fine xx so if you feel well in yourself you’ll be fine, we have our ops on the same day so fingers crossed our coughs dont stop anything going ahead!! xx