Curious to know about this 30 day situation?
As of May 31st 2015, all visas issued outside the UK which are valid for more than 6 months are issued in two parts:
1. Entry Clearance visa vignette valid for 30 days... gives one entry to the UK
2. BRP card valid for the length of the visa, which must be picked up from a UK post office within 10 days of entering the UK.
So that means that fiancé visas are still issued as a 6-month sticker in the passport but spousal visas are issued as a 30-day vignette and a BRP.
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