John Ashcroft, spokesman for Keep Sunday Special, told Premier that its not only churches that are concerned: "The unions are very concerned about the impact on shop workers and their families - in particular shop workers who aren't able to spent time with their children or elderly relatives.
"And small shops in particular are concerned that it will divert trade from small shops and convenience stores to the large supermarkets and put small shops out of business."
Mr Ashcroft stressed that it is important not to extend the trading hours for a number of reasons, citing religious duties, family time and economics.
Two-thirds of shop workers already feel under pressure to work Sundays when they don't want to Join our campaign http://t.co/REQUJlFJyF #KSS
— Keep Sunday Special (@KSundayS) September 4, 2015He added that MPs need to listen to the public: "It's important that MPs know that there is widespread public concern about this issue.
"Some local authorities are also starting to consult their local residence so if you're local authorities asking what would you like to happen - then that's your choice to have your voice heard."
Speaking in April, Tony Ashcroft, from the campaign, told Premier that giving people a day for faith and family is important: we "need to recognise the impact on people and find the right balance between the benefit of convenient access to services and the protection both of family life, and also religious observance for those for whom it is important."