"If you do not keep a strictly kosher home, you are encouraged to provide hekhshered packaged goods or catered food. " (source)

"With hechshered foods so readily available in UK supermarkets, convenience stores and petrol stations, it is easier than ever to access kosher food." (source)

"You can bring dairy or pareve food cooked in your home that adheres to our kashrut standards using hechshered ingredients where required." (source)