As for why Ilford was selling their film and paper under other names, before their receivership, they had the problem of excess capacity. Their contract with the Labour Union called for a fixed minimal staffing level, which had come to be twice what they needed.
So, they would sell to private label sellers at prices lower than their average cost, but above the marginal cost of additional product (materials, electricity, but not labor). It was barely profitable on the margin, but it probably cost them sales in their primary branded business.
Now Ilford has staffing levels in line with their sales, and while that's sad for the folks who no longer work there, it's the only way the company can operate at a profit. It's also the only way anyone can have a job there.