DH had already done a couple of trips to the car with the bags, and flowers, etc.
I walked out holding DD, we struggled to get her in the capsule and then drove off with the blue health book on top of the car - DH had put it up there while he popped DD in the capsule, and we didn't realise until we got home! Luckily it was still there! DH was just going to take DD out of the car, when he realised it was on the boot, and held it up, saying look what I did! He must've then put it back down on the roof, because when the mw came out the next day, we couldn't find it in the house, and yep, there it was on the car!