We have just received the passport back in the post which has a fiance visa valid in it until June, so the 30-day thing is confusing, and we've never had to do anything in terms of selecting where to pick up a BRP.
Can anyone shed some light on this?
The 30-day thing does not apply to fiance visas... so none of the information you quoted is relevant to you.
Visas are issued in different formats depending on how long they are valid for.
- Visa valid for up to 6 months (i.e. visitor visas or fiance visas) are issued as a 6-month visa sticker in your passport. You can enter the UK at any time during those 6 months.
- Visas valid for MORE THAN 6 months (i.e. spousal visas) are issued in 2 parts:
1. A 30-day visa vignette in the passport, and you must enter in those 30 days
2. A BRP card valid for the length of the visa (i.e. 33 months for spousal visas) which needs to be picked up from a UK Post Office within 10 days of arriving.
In your case, you have a 6-month fiance visa, so all you get is the passport sticker and you don't have to worry about the BRP card. Then, after you are married, your next visa (FLR(M)) will be issued as a 30-month BRP card only.