Is it not the case that a remortgage that increases the outstanding mortgage on your PPR can result in you being able to write off 75% of the increased mortgage interest, up to the value of the rental property, provided you have evidence that the reason the PPR mortgage was increased was to purchase the rental property.
The mortgage doesn't necessarily need to be secured on the rental property itself, nor does the rental property have to have its own mortgage.
This is the best way to finance a rental property, given the lower rates on a residential mortgage.
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