Is it the case that you do t want to ask the mortgage lender themselves about this, as you fear it will remind them that you’re there are highlight that you aren’t on track to pay off?
With this amount if time to go, don’t worry about that. Actually knowing what their process and timescales are which will really help you make informed decisions about this. I’d approach them and ask about their procedures and processes.
It’s good you’re trying to plan ahead, as like others say, if you let the mortgage term run out, it can be unpleasant and options available reduce and become less favourable.
Will you need to move to somewhere significantly cheaper and smaller and/or in a very different location? I’m asking if this will bring about a major lifestyle change for you and is it something you’re not looking forward to, or something youvela always expected and factored in. Is the fact it won’t pay off a surprise to you and has taken you by surprise?
I ask those questions, because the answers might mean you could plan to move much sooner if it won’t be too much of a lifestyle change or too traumatic. If it’s all not what you wanted or means big relocation and change of life I can see you want to leave it as long as you can, whilst still ensuring there’s definitely enough time to sell before you get anyone on your back about the mortgage....but quite how close to the end of the mortgage that point is, only the lender can tell you.
Do be aware it can take well over a year to sell. Ensure you leave far longer than you think it might take, to avoid the difficulties of getting too near the end of mortgage.