A Lego-loving couple has spent four weeks working 14 hours a day to create a 21-foot-long replica of the Old London Bridge in their own sitting room. Every year, Mike Addis, 63, and Catherine Weightman, 58, build a massive Lego creation around the year-end holidays. And their 27th project was completed using 400,000 Lego bricks. The couple took four weeks to make the model after starting mid-November last year and finished in mid-December. They have re-created the Old London Bridge of 1400, one of several bridges which spanned the Thames at Southwark, including 78 houses, 500 mini-figures, a castle, and a chapel. It also includes guards patrolling the pay toll of the bridge and bakers and residents. The model will stay up until Jan. 6, when it’s traditionally taken down. The model was inspired by the medieval Frost Fayres, which were held when the Thames froze over from the 16th century. Their …