Sue - totally understand and appreciated but unfortunately they've interpreted the 10 days aspect incorrectly.
The
online guidance explains how
"if we approve the request, we aim to process the application within 10 working days, subject to any outstanding applications or requests for information (requisitions) that need to be completed first."
So the 10 days is an aim as I have explained above and the conveyancers involved should both be aware of that as well as the impact of the pending applications on the developer's title and how they can/might impact on a later sale for example.
The update they will provide will give you an idea of whether we can progress it swiftly or not. So that's essentially an answer to the first Q as to whether the prior applications impact in such a way as to make processing the plot purchase impossible at this stage.
If it is possible as the prior applications have no impact on the specific plot then the next stage is can it actually be processed and completed. That essentially means has your conveyancer submitted everything needed to enable it to be registered and there are no issues re quality of their submission.
So we need to get past the first update before trying to establish timescales