Its normal practice for the Authority of another nation to inform the CAA of your transgression and then, depending on the alleged offence, the UK CAA will take appropriate action and inform the original reporter of their solutions.
Unless you've flown through a Presidential Motorcade baring your nether regions as you do so, it's very unlikely that anyone will hold it against you.
If the CAA knock on your door and lay out the facts and you know you've made a mistake rather than a deliberate act, admit it and take the advice they give you.
If you are guilty and deny it, the CAA will report their findings back as above and you should be aware that some Nations have longer memories than others......