Nicola Walker says she was delighted to return to hit drama The Split but the emotional plot reduced her to tears. The two-part Christmas special comes two years after the show’s third and final series, as family lawyer Hannah Stern, played by Walker, and her family gather in Spain for a wedding. Nicola, 54, says even her son welled up when she read him the script, adding: “There are a couple of scenes towards the end and I was an absolute wreck. “I was a mess in my kitchen, wiping tears away