Sues right , a subsidery of the Abbey are offering Sterling remortgages to UK/US homeowners. As far as I know they are for remortgages only, and there are lots of criteria to be met, I looked at it and by the time I added in the set up fee's etc I was no better off. My variable US mortgage this year reduced to 6.5%.
Re rental income verses costs, unless you secure 100% rentals at high rates and work really hard at getting those rentals expect to fork out each month. Of course you could always remortgage your home in the UK and use the funds for a US purchase....but do you really want to carry that much overseas risk on your main home?
I've written this to you before, if you can't afford it 100% then I personally would not do it.....have a look at DVC, its far more affordable and a lot less hassle.
Many villa owners are feeling the pinch with the downturn after last years events, its not the first problem period either, several years ago during the tourist crime waves many folks lost rental homes due to lack of business. Your running costs will pretty much stay the same if your villa is occupied or full.
Also remember homebuilding is increasing at an unheard of rate compared to the UK, they say that just in the 192, Lake, Polk four corners area there are 12,000 licenced short term rental homes, and god knows how many unlicensed, all competing for the same business as you.