Theres one in Newcastle called R&P Woods, one just off the A19 called A19 test and tune, TurboPacs in durham, and the one in Ryton is called DBM i think.
ive used DBM, wasnt too keen on them to be honest, turbopacs seemed quite good, when they chipped my old valver engine, my mate tried using a19 for his nova turbo but they wouldnt tune it when he turned up over a disagreement about intercooler size, so he wouldnt recommend them, r&p woods is meant to be good but is hard to get booked in supposedly as hes dead busy!
where in the north east you from?