I'm buying a new build house in the UK and want advice

As the title says I'm a first time buyer buying a new build in the UK. It's built by the council and a reputable builders and has the standard warenty and such so I'm not too worried about quality but it's still a huge life change. I'm getting the keys and moving in in a fortnight. I don't have too much stuff to move in as I've been lodging for a while, lots of furniture to aquire! For those who've done this before, what did you wish you knew at the time and what should I look out for?