It's getting difficult to buy anything that is effective in the UK.
This is what I use.
https://www.purpleturtle.co.uk/product/lifesystems-ex4-clothing-treatment-350ml-10727/
There is also this.
https://www.amazon.co.uk/Menforsan-Insecticida-Desodorante-Roedores-125-ml/dp/B01MY0JK9U