Add the vinegar, water, sugar and salt to a saucepan and bring the liquid to a boil, stirring occasionally to dissolve sugar and salt.
Simmer for a minute or two and, once salt and sugar are fully dissolved, remove from heat and allow liquid to cool slightly while preparing the rest of the ingredients.
Place sliced cucumber into a large jar and add remaining ingredients to the jar.
Pour the liquid into the jar, fully submerging the cucumber and seeds and herbs.
Put the lid on the jar and place in the fridge to fully cool before serving - at least an hour.
