looking at purchasing a second home (flat).advice greatly appreciated NSC

[Tricky Dicky]

Oh, and for the record, I think off-hand that the part of the mortgage on the second property is a BTL loan -but it must be the cheapest money I've ever borrowed, it's peanuts really. I've not really done the maths though.

 

[Triggaaar]

Check the price of using equity from your own place (compared to mortgages on offer).
And then just look at buying the new place with a mortgage as if you were going to move into it. You're not doing it as a buy to let anyway.
(obviously I'm not an FA, so this advice is simply what I'd do, etc etc)