I assume it's fine to get on the plane the day before as long as it arrives on the right day, though the airline may check his visa before he gets on the plane - I'm not sure if that will be an issue or not.
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So, he just got the pack and opened it just now and its APPROVED

This visa is actually valid from the 15th - interestingly. Not the date of issue, not the date of 'intended travel' - somewhere inbetween.
Husband MADE me phone the support line to check whether he could fly sooner (even though I told him I already know the answer!) but they confirmed it (waste of money lol) however one interesting point they DID say, was that we should DEFINITELY check with the airline whether that was acceptable to them. Apparently, some airlines will not let you travel the night before, even if you will actually land in the UK on the date the visa is valid from. So, he's going to check when booking as we don't want to waste money rebooking.
Slightly giddy with excitement at the moment, and think it will all hit me later when I get home. Again, thank you to everyone for your support and stellar advice.
