Posted: 30/08/2015 at 12:56
Rufus arion also known as the Large Red Slug - we have loads of them too! Don't worry, they're good guys - they're carnivores and eat the little slugs which are the ones that eat our plants.
They're out and about on damp nights at this time of year 'cos it's when they do their canoodling and make lots more Rufus arions - I love to see them - they're magnificent.
As they will also eat decayed vegetable matter, if you don't want to see them pop them into the compost heap.