@MrFlippersPancake
It's an absolute joke. We did shared ownership on a very small development back in 2012 and then we were lucky enough to staircase to 100% 2 years later. It is ridiculously tough. The absolute joke when we applied for the mortgage for the shared ownership property was that only a few lenders lent on this kind of scheme and it was a lot more expensive as you were seen as more of a risk to the mortgage lender. It felt a bit like banging your head against a brick wall at the time.
We had real issues staircasing.
The mortgage lender looked at the figures and thought it was crackers.
Our mortgage plus rent was something like £750 a month. We had a proven track record for paying, had a perfect credit rating, we were well within what we could afford otherwise with our expeditures, we had over paid our mortgage, our household income had more than doubled, we had no kids. The value of the house had even gone down. But because we couldnt raise the required 15% deposit and were no longer eligible for a first time buyer mortgage (even though it was still our first house) the lender we were with wouldn't offer us a mortgage. It was crackers.
The woman handling our case said she had never seen a case so absurd but it was down to the rules at the time and she didn't think it was remotely increasing risk to the bank - indeed quite the opposite. The reason we wanted to staircase was because of how much our rent was increasing annually with inflation and we wanted to stop that.
When the bank is telling you that they can see no earthly reason to reject you other than bureaucracy its nuts.
We eventually got a mortgage with another lender at 10% equity after a great deal of looking (because not all mortgages would take on a staircasing mortgage even though we were staircasing to 100% mortgage!!!).
The lending rules HAVE eased somewhat since then, though so in theory it shouldnt still be happening to the same degree.
But yeah, i do think it crazy. I don't think 100% mortgages should come back - a small deposit is for your own benefit too, but I do think if you can demonstrate you are already have good credit and are paying more than the mortgage on housing already, you shouldnt be being rejected on that basis.