If you don't enter within 30 days, what happens? seems like crazy short notice to book a flight and pack your life up! I got lucky with my flight as I had something sorted due to a problem with a flight prior (long and boring story) and luckily no furniture to pack!
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You have to send your passport back to UKVI and pay for a new 30-day vignette.
This is why it's so important to figure out what Intended Travel Date you put on the application form - to make sure you can travel within 30 days of it. They should honour the date you put, but lately they have been issuing the visa valid 7 days before the requested date.
If your date has passed before the visa is issued it should be made valid for 30 days from the date the decision is made.
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