If when purchasing a title document you see the message
"The title number provided is a pending first registration so we are unable to supply an official copy at this time. Please make a new request when the first registration is completed"
this means the title is on the process of being registered with the Land Registry and isn't available to be purchased yet.

The time it takes for a title to be registered with the Land Registry can vary depending on several factors, including the complexity of the transaction, the current workload of the Land Registry, and whether there are any issues or errors in the application.
For straightforward cases, such as the registration of a transfer of property where no new title needs to be created, it typically takes between 4 to 6 weeks.
Transactions that involve new builds, first registrations, or more complex dealings can take longer, often ranging from 6 to 12 weeks or more, depending on the circumstances.
If there are errors or missing information in the application, the Land Registry may raise requisitions, which can delay the process.