Hannah's best friend from university arrives home from travelling, now with a fiancé in tow — charming vet, Rich. He offers Dan a job at his practice, but Hannah can't stand him.

Dan and Hannah are back at their old school. Hannah has been asked to make a speech in front of sixth formers attending a careers day, whilst Dan just fancies a snoop down memory lane.

Dan has finally booked himself in for an appointment at the STI clinic. There, under examination, he meets funny and free-spirited doctor Izzy.

When Dan and Hannah's neighbour asks them to look after the exotic fish in his flat for a few days. What could possibly go wrong?

Hannah and Dan's beloved drama teacher Mr Balcombe has died and Dan and Hannah have mixed emotions about the funeral.