The Lords doesn’t actually have the power to veto bills thanks to the Parliament act. They also have a principle of ultimate legislative priority under which they defer to the commons in matters where the commons puts its foot down. They generally act as a revising body rather than outright attempting to defy the commons.
> Under the Parliament Acts 1911 and 1949 it is possible for a bill to be presented for Royal Assent without the agreement of the House of Lords, provided that certain conditions are met. This change was seen by some as a departure from Dicey’s notion of sovereignty conferred upon a tripartite body.
https://commonslibrary.parliament.uk/research-briefings/cbp-...