We had to reveal all of our houses and loans on our mortgage application. They had no way to verify, but the penalty in that case is always fraud. But there are definitely a lot of people out there who don’t think that is a serious problem, and the government has to come down hard on it:

https://www.magnifymoney.com/blog/mortgage/lying-mortgage-ap...

Is the UK more tolerant of lying than the USA? It doesn’t seem so via a Google search:

https://www.onlinemortgageadvisor.co.uk/mortgage-application...

Now, of course, they might not find out, but that just means it is a perfect crime, it is still a crime.