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Yor mortgage deal will likely turn into a standard tracker at the end of the period (your paperwork would be able to confirm this), if you do nothing.
If you remortgage with the same provider, it's likely they will not make any checks, and you can take advantage of lower rates (your broker should confirm)
If you shop around, any new provider will likely do the full suite of checks.
Our two-year fixed runs out at the end of June I think. L&C (our broker for first-time buyer fun back in 2018) has been in touch to get a new deal. We're self-employed and affordability was a big struggle last time as turnover was good but most things were allowable expenses so our profit appeared minimal. Getting corona'd in a big way at the moment work-wise so looking at a holiday. If we take them up on the current offer, are the lender obliged to overlook it?
On the other hand, when they do their affordability checks if they deem we can't afford to continue (even though we could, even, at a pinch, with coronafun) what is the actual outcome? Do they just up the interest rate so high that you have no choice but to default?