Probably the bare minimum 3% yes
Pensions work a little different here.
1) Workplace private pension is similar (identical) to SA. They take the monthly premium before tax, so that is your tax rebate on the monthly payment.
2) On private pension, you are obviously paying in after being taxed on your salary. Now what happens here is that when you pay into a private pension, the government adds 20% to the payment, and that is your tax rebate. There is a slight caveat to this as depending on your tax bracket, you can actually lose some tax benefit here unless you submit an annual tax assessment (return). Basically, if you earn over £50k per annum, it will be more tax beneficial to pay more onto workplace pension to get this tax rebate/saving rather than pay into private pension, unless you are willing to do annual tax return.