The Government should ask the public if they want an electoral system that is more representative by holding a referendum on whether to keep First Past The Post (FPTP) or change it to Proportional Representation, for all elections the UK Government sets the rules for.
You may be interested in these active petitions
A fine example that FPTP is undemocratic was again expressed at the last GE of 2019, where the SNP vote was 1,242,380 (45% of the vote) and gained 48 seats (81% of all seats). Outcomes like this are extremely unjust.