This is one of dozens of amendments proposed by members, so it's more accurate to say "three members of the House of Lords attempting to ban the use of VPNs".
> In the United Kingdom, section 1(1) of the Parliament Act 1911 provides that the House of Lords may not delay a money bill more than a month.
This is the closest thing the UK has to that.
There is however the Salisbury convention which is that the HoL shouldn't block legislation that was a manifesto commitment of the governing party. That doesn't meant they can't amend it at all, but they can't substantively change it. It's also just a convention, not a rule.
It's generally fine-tuning rather than another massive hurdle after getting it through the Commons that the Lords might not pass it at all, though.
You might be thinking of 'royal assent' which is pretty much just a rubber stamp, yes, post-Lords.