Which visa is this for?
When I applied for my spousal visa, I requested it start mid february so I could give notice to my job and sort my life out. Instead, they made it start the day processed it (Dec 15th). So by the time I got it, the clock had already ticked 2 days. Jerks.
When did you apply for your visa? The 30-day vignette has only been issued since the end of May 2015.
If you applied before May 2015, you would have been issued with a 33-month visa sticker, which would have allowed you to enter the U.K. any time in those 33 months, but you needed to enter within 3 months and 28 days in order to qualify for ILR in time.
With the new vignettes now, you only have 30 days to enter the UK from the start date (instead of almost 4 months), so they are more careful to make it valid for the right date now.
If the date you put on the application has not yet passed when the visa is issued, the vignette should start 7 days before the date you put. If the date has passed, the vignette will normally start 7 days after the decision is made.
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