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The government can't just do anything they want without passing bills through parliament, unless it's a supposedly minor change which ministers can make according to an earlier act (known as a statutory instrument).
The Lords cannot block a bill introducing something that was in a winning party’s manifesto (Salisbury Convention) but can reject (for a while) or delay (for a parliamentary year) legislation that wasn't.
tbc-
The government can't just do anything they want without passing bills through parliament, unless it's a supposedly minor change which ministers can make according to an earlier act (known as a statutory instrument).
*Laughs in brexit bill*
(Which gave the govt. a ridiculous amount of leeway in making primary legislation via statutory instruments in the guise of repealing / rewriting previous EU driven legislation without having to tie parliament up forever with debating all thebthings. Although that was also done when we joined, way back, so it's not without precedent.)
NotThamesWater
Hang on are we mixing up whether the Lords pass bills which were in the manafesto?
Surely a government still has to pass a bill to pass the laws on how the electoral system works? For which they'd then need parliamentary majority.
I guess a key calculation is how many Tory seats the lib dems and greens take. Because they'd definitely vote for it, so as long as you have a decent number of Labour MPs in favour it'd go through.