Just for the record - Wifey's visa was approved in 5 weeks and the travel date on the form was entered as 20 Aug 2015 and the vignette in her passport is dated 15 Aug 2015 - 14 Sep 2015.

According to the documentation she received she wont be able to collect her BRP from the post office until 21st Aug, leaving her either Friday the 21st or Monday 24th as the only two possible collection dates without being outside of the 10 day collection rule as she will travel on the 15th Aug 2015.