A retired couple who sued developers after a 17-storey £35m office tower next to their home blocked their light, making it hard for them to read in bed, have been handed a £500,000 payout by a judge.Stephen and Jennifer Powell complained that the Arbor tower, part of the £2bn Bankside Yards development, "substantially" reduced the natural light getting into their 6th floor apartment in the designer block Bankside Lofts next door on London's South Bank.