Are there any limitations on what can be proposed in one of the houses? For example in Australia our upper house (senate) can't adjust or propose bills to do with money.
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.
> 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.