If one is paid weekly (or indeed monthly) the tax tables automatically work out for the employer how much tax to deduct based upon: -
the tax code of the individual
the week number in the tax year
the amount of tax paid to date
the taxable pay in the week being calculated.
After one missing week' pay, the tax table should have calculated the tax due in the double week's pay as exactly twice that as due if the amounts were paid in the consecutive weeks (if the pay is the same).
In other words, it should have self-corrected.