Completely different process, requiring posting certified documents, a long and intrusive paper form to fill and post back, no invitation code issued. Usually it will take 6 months longer, and the first pension payment delayed by months.
Followed by, frozen pension, and frequent proof of life forms that will often result in pension payments being randomly stopped.
The DWP sent an invitation to claim my state pension to my Thai address 3-4 months before my pension was due, inviting me to ring them on +44 191 218 7777. No forms to fill in or supporting documents to supply.