New front wheel – the spokes are short

Laced but not tensioned
The partly completed loft conversion in use for wheel building. After I laced and trued both wheels I realised the spokes are too short. They are all 288 mm and they should be two sizes: 290 mmm and 292 mm (now on order). Not my fault though. The bike shop supplied the wrong length, so I’ve dismantled them both and will start again, at the weekend hopefully.