cool thankyou. just discussed this with my partner. im a panicker lol x
I am always worried, too, but as long as they have some kind of shelter, enough water (bowl AND bottle, to be on the safe side) and enough food and hay, they should be fine. There are some bunnies who die of shock when they see a fox or cat, but mine just watch interested, when an animal walks through our garden, they don't panic. If they can hide in a shelter, even the more nervous bunnies should be ok.
I'm sure the run is safe enough and nothing could get in. However, my concern would be the fright your buns could get if anything were to come into the garden. It's been said that I fright is enough to scare a bun to death, either from shock or from running away so fast that they injure themselves :? Personally I would be very cautious about leaving them all day unsupervised. But that's just me and I've never had an outdoor bunny.