Brexit is giving a big boost to exporters as the weak pound lifts sales to the strongest since the 1990s.Order growth for manufacturers was the highest in over two decades in the first quarter, the Confederation of British Industry said in a report on Monday. The news isn’t entirely positive for factories, though, as prices continued to rise and investment intentions for the year ahead softened.“UK manufacturers are enjoying strong growth in demand from customers in the UK and overseas” and “exports have surged,” said Rain Newton-Smith, chief economist at the CBI.“Even so, the combination of the weak pound and recovering commodity prices means that cost pressures continue to build.”