What are the tax implications of having two jobs?

My wife currently works ad hoc as a nursing assistant for the NHS whereby she works whenever she likes, even one shift in 6 weeks. She has accepted a part time clerical job but would like to keep the ad hoc as well so she make a little extra money if needed. Are there any tax implications like a higher rate for two jobs, or is each job taxed under it's own merits? Many Thanks.

she will get taxed more for her "2nd job", im not sure the detials but I tried to take on a second job and it turned out not to be worth the energy, although, your wife will prob work enough hours to make a difference, check it out at the tax office.

she will get charged normal tax for the first and 22% tax for the second.

Both jobs will tax you on basic, as they won't take account of each other.

However, at the year's end, you contact the tax office - who will either refund or charge more based on total money earned.

The tax office doesn't care if you have one job, or twenty - you pay an amount of your income. Having two jobs will muddy the waters in the short term.

If the nursing job is very irregular, she should contact HMRC when she starts the clerical job to request that all her tax free allowances are allocated to the clerical job. This will mka ethe most of her allowances and will mean that her nursing job will be taxed at 22%.
Having two jobs does not mean you pay more tax - the tax would be the same as if the income from both jobs was all earned in one job. She will also save on NIC as she will get the annual exemption (5225) against both jobs.