I was the same nearly 60 years ago @Tony337 and also not getting the banana sandwich when everyone else did. I got cheese or cold meat if I was lucky!!
Another one using tubed Tandem, which has never leaked.
Have you talked to your hospital team? Leaked insulin can be due to not rotating sites well, or pods becoming loose.
Sorry you've both had such trying times. Hope your sensor is now connecting @Tony337 and your next pod/site works well @Marie 2 Technology is great .... until it doesn't work and then it's a pain!!
I'd happily use test strips that were only out of date by such a short time, (at least for the ones I use), as I've found them just as accurate. I can't comment on the Gluco Navii though, as I've never tried them.
It can be 1, 2 or 3 years. Have you had any hypo's where you've needed help, or any other medical conditions that you've had to declare to the DLA? Just reapply next year, and hopefully you'll get it for 3 years.