I should also add that we included a cover letter in the application to explain these strange issues we encountered during the application, having to use hypothetical visa expiry dates to help the IHS calculator, so to speak and that we hope to be refunded the excess amount paid.

So we were in your shoes just few days ago. Eventually, I saw a similar post on here and someone suggested calculating the number of years from the date of application, so in our case, we applied on 26/6/2021, we then entered 26/6/2026 as main applicant’s visa expiry date (though he has no visa yet, ...