Ah, a Walford Christmas! And 1997 is proving as miserable as any other year, as we see Tiffany and Grant’s marriage savagely disintegrate. But is it our imagination, or are those lights on that infeasibly large Albert Square Christmas tree burning brighter than usual this year? Must be the sparks of electricity flying between the ever-glamorous grandma Kathy Mitchell, and cockney vicar Alex Healy (brother of Mel, in case you’d forgotten, which she seemed to on her last return). The pair are thrown together while making Christmas dinner at the local women’s refuge. Soon, the warm charitable glow of their good deeds overtakes them, and while they embrace, nothing or no one else in the world appears to matter. Well, apart from poor Peggy, who is set to arrive at…