Plot: In this festive special, George visits an incredible man-made stalactite crystal grotto in Surrey and meets a small spaces enthusiast who has rebuilt and renovated a Victorian flatpack tin chapel in Shropshire to create a magical holiday home. George catches up with carpenter Adam, who created a double-decker bus holiday home on the Brighton coastline, with Jay and Jonathan at their ambulance-turned-campervan in Norfolk, and Barry at his hexagonal home in Lancashire