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The depreciation in Sterling after the Referendum was 'solved' by Mark Carney telling The City that he had a bottomless bucket of quantitative easing.
That trick might not work after March 2019.
The only other economic lever the Bank of England possesses is interest rates,
especially to support a Sterling cut adrift from its major market.
Back in the early '90s a rise of 8 to 9%, (etc) was painful, but the actual change in the monthly payment was slight, until we got to 15%.
At the moment with interest rates at historic lows, the many mortgage payers who are 'just about managing', a small change in mortgage rates means a huge change in monthly payments. Those coming off of a short term fixed rate could find themselves shafted.
Isn't Brexit more likely to slow the economy and so delay a rise in interest rates?