Amounts below are for example only, but I presume wont make any difference to the actual recommendation.
lets say I have a flexible mortgage of 50k. I also wish to buy a BTL property , cost 200k I also have a lump sum of 150k.
here are my thoughts.... pay off mortgage except for 1, (so I still have the mortgage). use remaining 100k of lump sum, plus new loan of 100k on the original mortgage, to buy BTL property.
reason for doing it this way is that now all the interest payable can be shown to be against the BTL property (rather than complexity of some is my house, some is the BTL) and this is offset against the BTL expenses, plus I dont have to take out a BTL loan at a higher interest rate.
is this a good plan? (lets leave out discussion on the merits of BTL and HPCs etc please, its being done to house a relative not to start a property empire.)