Experts have identified the chemical which has caused a pollution incident off the South West coast. It's an oil additive, known as polyisobutene. Meanwhile the RSPCA Wildlife Centre in West Hatch is continuing to deal with birds caught up in the spill. Watch Caron Bell's report.
Some of the seabirds washed up on the Dorset coast covered in an oil-type substance have been released back into the wild today.