UPDATE 2-Bank of England imposes first limits on size of UK mortgages
* BoE toughens mortgage affordability tests, lending rules * Only 15 pct of new UK mortgages to exceed 4.5 LTI ratio * Carney says measures will not affect rate rise plans * GRAPHIC: House prices vs earnings http://link.reuters.com/fyg34s (Writes through, adds bank and analyst
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