For a country that imports more than it exports, a weakening currency is bad. The loss of revenue from the increasing price of imports will trickle down and start affecting the general population. It's really bad for savers too (if your savings are in gbp of course).
The only UK companies this is good for are those that rely heavily on exports, preferably using resources that they buy from within the UK.
A strong sterling would merely prolong the balance of payments deficit. A weaker pound increases labour competitiveness and encourages exports. It is a sledgehammer of an instrument, but to call it wholly bad is to overlook the pre-existing malignancy.
yes,you can refer,in part, to chinese yuan
US goverment didn't like much when China kept their currency weak ,it hurt their feelings
but with GBP it is slightly different,majority of the GDP comes from financial instruments and trade,not production
weak currency allows countries to develop their own strong production system and not to be reliant on pure financial sector profits
now when the banks declared their own bankbrexit I feel GB would have to pay more attention to their labour class
