When lenders look at your credit report, they can see any previous searches that resulted from you applying for credit. Lenders are allowed to use these searches - called “credit application searches” to help make decisions about you, normally when calculating your credit score.
Our check leaves what is called “a soft footprint” meaning that nobody other than yourself will be able to see the check. The check leaves a soft footprint so that you know that the check has been performed. Theses checks are quite common for ID checks, you also get them when you apply for insurances quotes. This check is not a credit-application search (hard footprint check) so it does not affect your credit score.
Here is a quick article from thisismoney.co.uk with more info on soft footprint checks.