Hello, this is Jim, a dual-qualified lawyer (UK & Republic of Ireland) and happy to help you today.
The way forwards would be to send the person who breached copyright a cease and desist letter to warn them of your intentions unless they stop (and give them 7 days to stop their conduct).
A template “cease and desist” letter is available at https://www.lawdepot.co.uk
If you go to the search box in the top right corner of the site, it will bring up a list - you want the "general" letter.
You can use your own letter if you wish - it just has to make it clear this is a cease and desist letter, that you demand they remove the content, and that if they do not within 7 days you will apply to the court for the injunction and seek your costs. You can also seek damages if you have incurred any financial losses.
The letter may work as an injunction is a serious step. You can email the letter to them and indeed the letter is required - the court will want to see you have put the offender on notice of your intentions before you take the step of involving the court. If you still need to apply (the letter having no effect) please come back here and I will give you further details of how to apply.
I hope this helps? If I have answered the question would you kindly leave me a 5 star rating (at the top of your screen), any follow up questions are welcomed.