Serena and Edward arrive at work loved-up and energised, but when Mary-Claire makes clear she won't forgive Edward's treatment of her and their 'relationship', Edward is forced to confess to the affair. But is his drink problem as easily dealt with? Zosia is determined not to let her dad easily back into her life, but when a patient spots her lonely demeanour and gives Arthur some tips on a Polish Christmas, she finds herself with a smile on her face. A gift from her Mother is the icing on the cake. Mr Thompson is doing a great job of entertaining the patients in his Christmas elf outfit - so much so that it takes one of his delighted fans to point out the obvious to Mo - they'd make a great couple! Has she got the courage to ask him out?