Thorntons were a Sheffield brand ....a pleasant childhood memory in the days of sweet rationing.... They were a welcome diversification from the City's staples of steel and engineering. Sadly, they moved out of the City into Derbyshire some years ago. It would seem a combination of the fairly recent take over by a multi-national ( whose products , in my humble opinion, are not in the same league as are Thorntons )and the disastrous commercial affects of Covid 19 seem to have put the seal on those little shops, with staff wearing a distinctive uniform, selling the best chocolates ( with or without nuts) and above all else...Special Toffee. Another sad day!
As for the warning very many food products now carry this in order to minimise the chances of litigation should an odd piece of nut escape from the cleaning process and accidently become incorporated in another product. This is standard practice for most food manufacturere whose production lines sometimes included nuts! Accusing them of breaches in hygeine regulations really shouldn't be made without proof!🙄