This quote from the RAF internet site explains it:
The Hawk T2 will be built at the BAE Systems site in Brough on Humberside and assembled at their Warton facility.
I had the pleasure of collecting a few brand new Hawk T2s from Warton a few years back. Flying in a jet where the paint in the cockpit is not chipped and the straps are not frayed was a rare luxury. It even had a pseudo new car smell to it.
BV