When legalisation is required for Bulgaria
Most UK papers headed to Bulgaria do not go through full consular legalization for Bulgaria. The country has an agreement accepting simpler certification, so what would normally involve multiple steps abroad becomes one step at home. You only need this service for rare cases where the Bulgarian receiving authority explicitly demands embassy attestation for Bulgaria because of specific local rules or document types. Even then, check first whether your office really requires it, as most do not.
The simpler alternative for Bulgarian use
For standard papers like birth certificates, marriage records, or company documents, Bulgarian law allows a single certification that replaces the old-style chain. The Legalisation Office in Milton Keynes handles this step, and you can send your papers by post. Since Wolverhampton itself has no government legalisation desk, anyone in the area uses the national service just like the rest of the UK. This streamlined path covers the majority of needs to legalize documents for Bulgaria, and it's much faster than embassy circles.
If you do need embassy legalization for Bulgaria
In the few cases that demand full legalization, you'll start at the Wolverhampton Register Office for civil records. They can issue a fresh certified copy of your birth, marriage, or death certificate at the Civic Centre on St Peter's Square. This spares you from sending your only original through the post. From there, the paper moves to the FCDO's Legalisation Office in Milton Keynes, the only office that can place the UK certificate. Then comes the longest part of document legalization for Bulgaria: the embassy step, though current international agreements mean few people take this path anymore since the simpler version suffices.