Reviewed by Patrick WestWILLIAM HEINEMANN, 348pp, £14.99Tablet bookshop price £13.50            Tel 01420 592974 Set to the background of a north London increasingly settled by bankers and hipsters, a south of France infested by British expats, and a soulless Dubai where philistine traders abound, Completion tells the history of a disjointed, dysfunctional family bidding goodbye to a home steeped in bitter-sweet memories.The father and mother, Jerry and Pen Manville, once the envy of their peers, are now divorced: he had been a successful advertising agent, she the creator of a string of popular children’s books with the series title “The House on the Hill”, based on the family home and featuring versio