Just as in the USA, reported wages are gross, before deductions for tax, NI contributions or any pension contributions.
As far as the pension contribution match by your employer, someone else will have to jump in who knows more than I, but I believe it is not taxable until such time as you withdraw benefits. I was briefly in a employer pension scheme in the USA many years ago, and the employer contributions were not taxable income. I left that job after I was vested in the plan, but rolled everything into an IRA.