Thanks DayTrader and Bronte, Good comments from both of you. Very helpful in trying to develop a strategy.
The mortgage is a long term tracker, so does not revert to variable rate automatically. However, if I break the terms , then they have that option as far as I can understand in the paperwork. So is same thing , I guess.
Bank has offered, by e-mail to the branch, to extend the mortgage for a further five years on Tracker as now , ECB plus 1%. Cannot afford that amount. Is similar amount to gross rental income. However , this does not take account of income tax, property tax , maintenance and void periods without tenants and all other running costs. Plan at present, is to take strong line to begin, of requesting interest only for next five years and saying that then I will and do expect to be in a better position then to start also re-paying some capital. Probably true in fact. Will see what happens.
Probably, they will threaten adding interest penalty clauses, or switching to higher variable rate and possibly to court. However, court will throw them out if I am already paying the interest charges, even at tracker rate, I think. They will know that also.
I will now take your suggestion and make appointment and talk first to the local manager, who I do know reasonably well. Not that this will count so much in present climate. Keep you advised. Any further thoughts/comments ? Many Thanks, JJT.