No, this is completely wrong.
If you choose to trade CFD’s using an account that’s regulated by the UK’s Financial Conduct Authority (or by Australia’s ASIC, or by any European Union regulator), then in practice the maximum leverage you can get is 1:30, simply because those regulators aren’t permitted by law to regulate higher-leverage accounts than that. That’s perhaps what you were thinking of?
But it’s definitely not a crime for anyone in the UK to choose to use higher leverage, if they want to give up all their rights to protection from a real regulator with both the power and the willingness to help them, if ever they have a dispute with their broker.
It’s the kind of thing we all decide for ourselves.
Personally, I’m not anxious to use higher leverage than that anyway, but some people, especially those with little experience, would feel differently because the world’s full of losing traders who believe that lack of high leverage hinders people’s ability to trade profitably, and there’s certainly no shortage of unregulated counterparty “brokers” who like them to continue thinking that way. 
All those “brokers” choose to avoid real regulation so that they get the protection, rather than their customers, when there are disputes.
And “strangely enough” 
those are exactly the brokers whose customers seem to have almost all the problems. So, for many people, it’s not really a very difficult decision which kind of broker to use. 