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GB suffered a 14.9%, or £4m, funding cut after missing their London 2012 medal target of five to seven medals.
As a result Furniss has overseen a drastic cut in the number of funded swimmers and has insisted on more regular competition.
“We’re taking some out of their comfort zone but we’ll benefit,” he said.
“It’s not a choice for the athletes, if they are on the programme we are telling them they have to do this, so we’re forcing a bit of change.”