Hi Bethany,
So we spoke to several different solicitors to try and understand the risk with it and essentially they said to check if the developer had the transfer deed for the land and had the rights to build, then to make sure that an application has been submitted (which it had and we were given a breakdown of when it was submitted/picked up to get a better idea of timings) and then to make sure your mortgage provider would be willing to do a product transfer should the situation come round that if you are still awaiting registration when your mortgage runs out they will offer you a new product!
So each of those points were confirmed for us and we were informed that once the developers title is registered if needed we could always expedite our own application and HM Land Registry should help with that.
The land is still not registered but as you may have seen above we are expecting enquiries to be answered on the 9th May and we confirmed they had the transfer deeds so an application was all going through. We just made sure we safeguarded ourselves as best we could and hopefully it will all be registered - but we considered all risks and still decided to go ahead with the exchange.
Hope that somewhat helps! :)