Sent electronically by HM Land Registry straight into your certificate, read in and explained: nothing to post, nothing to re-key. Ordered while they are shut, it is collected when they reopen and you are emailed. Nothing is charged unless it can be delivered. Only documents HM Land Registry can send electronically are offered, so nothing arrives by post.
One document the register refers to: the lease, or a deed such as a conveyance.
A long lease of a flat: the term, the ground rent and how it rises, the service charge share, and what the tenant and the landlord each promise. It is of another fictional home, Flat 2, Sample Court: a flat's own register is a separate leasehold title, whose part A describes the lease.
A typed deed of 1963, the kind the register refers to for old covenants: the parties, the price, the fencing covenant, and a plan with T marks on two sides.
These are demonstrations made by Homeproof. What you receive is HM Land Registry's official copy for your property, issued through their Business Gateway, sealed into your certificate.