Naomi...you may think its wrong but one of the main purposes of an opposition is to harry the Government so that it fails and loses a vote of confidence.
But I realise that is unlikely with the current make up of the HOC.
According to the Guardian this morning, 27 rebel Tory MPs voted against this Bill ::::
http://www.theguardian.com/business/2016/mar/09/cameron-defeated-in-commons-over-plans-to-relax-sunday-trading-laws
Its also apparent that Dave mismanaged the debate by submitting an amendment too late to be accepted by the Speaker and MPs.
The Guardian link makes for interesting reading....
" the real damage to the government was done by 27 of its MPs, whose rebellion underlined Cameron’s weakened grasp over his parliamentary party and highlighted the fractious mood of backbenchers in the run-up to next week’s budget and June’s referendum on membership of the European Union"