Because voter fraud isn't really a big thing here, and loads of people don't have voter ID so requiring it of them would disenfranchise many more people:
https://www.electoralcommission.org...lectoral-fraud-data/2019-electoral-fraud-data
For context 47,587,254 people cast votes in the 2019 General Election (not counting the others listed below).
592 cases of alleged electoral fraud were investigated by the police. Of these, three led to a conviction and an individual was given a police caution.
This table shows the number of cases of alleged fraud the police reported to us, for each election held in 2019.
Election | Number of cases |
---|
Local elections | 362 |
UK Parliamentary general election | 161 |
European Parliamentary election | 21 |
Non-election specific (for example, electoral registration) | 21 |
Local by-election | 12 |
UK Parliamentary by-election | 7 |
Mayoral election | 6 |
Combined authority mayoral election | 1 |
Police and Crime Commissioner by-election | 1 |