The UK would benefit from scrapping the Sunday trading laws for several reasons, primarily focusing on economic growth, consumer convenience, and alignment with modern societal norms.

**1. Economic Boost:** 
Scrapping Sunday trading laws would allow businesses, especially retailers, to operate for longer hours, generating more revenue. In an increasingly competitive market, retailers could maximize their sales potential, which could lead to higher profits, more jobs, and increased tax revenue for the government. Small businesses, in particular, could benefit from the extra trading time, as they often need more flexibility to compete with online retailers that operate 24/7.

**2. Consumer Convenience:**
The way people shop and live has changed dramatically in recent years, with many consumers expecting greater flexibility in retail hours. Removing Sunday trading restrictions would better align with modern lifestyles, allowing people to shop at times convenient to them, particularly those who work irregular hours. In an era where online shopping is available at all times, restricting brick-and-mortar stores puts them at a competitive disadvantage.

**3. Outdated Law in a Secular Society:** 
Sunday trading laws have their roots in religious observance, reflecting a time when Sunday was widely regarded as a day of rest. However, modern Britain is a multicultural, secular society, and many people no longer observe Sundays in a religious or traditional manner. The laws are outdated and out of step with contemporary values, imposing restrictions that no longer reflect the majority’s needs or preferences.

**4. Flexibility for Businesses and Workers:**
Allowing businesses to choose their own Sunday opening hours would grant them the freedom to make decisions based on customer demand, rather than government mandates. For employees, scrapping the law could provide more flexibility in working hours, offering those who prefer to work on Sundays the opportunity to do so, while maintaining protections for those who do not wish to work.

**5. Supporting Tourism and Leisure Industries:**
For cities and tourist destinations, extended Sunday hours would help accommodate visitors who expect major retailers and attractions to be open. The tourism industry is a significant part of the UK economy, and relaxing trading laws could enhance the experience for tourists, ensuring they can shop, dine, and enjoy leisure activities without restriction.

In conclusion, scrapping Sunday trading laws would stimulate the economy, cater to modern consumer demands, reflect the realities of a secular society, and give businesses and workers greater flexibility. It is an outdated policy that restricts economic potential and should be reconsidered.