Mr. Ruff talks to Reg Ward about his invention, the Solarium, which enables people to bring a tropical sun right into their living rooms. ... He likes the sunshine as much as anyone else, of course; unlike most of us, however he does not need to stir outside to feel it. ... They use the invention just to satisfy the holiday-makera#39;s need to sport a tan. ... Running costs however are remarkably cheap a under 50p an houra so that a hotelier who fancies havin? one on his own premises needanbsp;...