The Maritime and Coastguard Agency (MCA) said polyisobutene (PIB) can be released under certain conditions.

BBC: RSPB calls for ban on seabird pollutant

More than 300 birds were rescued after being found covered in glue-like polyisobutene (PIB) on the south coast.

BBC: Birds oil pollution ship 'cannot be found'

Hundreds of birds have been left covered in polyisobutene (PIB) in two incidents on the south coast this year.

BBC: Calls to stop PIB discharges at sea after bird deaths

Hundreds of birds, mostly guillemots, were washed up on the south coast of England three weeks ago, covered in glue-like polyisobutene (PIB).

BBC: First birds released after south coast oil rescue

More than 300 birds, mainly guillemots but some razorbills, were taken in by the RSPCA after being found covered in glue-like polyisobutene (PIB).

BBC: Dead bird at Portland - Jason Hoad

In February, more than 300 birds, mainly guillemots and some razorbills, were taken in by the RSPCA after being found covered in glue-like polyisobutene.

BBC: Dead bird on beach between Downderry and Seaton

In February, more than 300 birds, mainly guillemots and some razorbills, were taken in by the charity after being found covered in glue-like polyisobutene.

BBC: 'Sticky substance' birds rescued in Devon and Cornwall

The RSPB has called for polyisobutene, which can be released legally under certain conditions, to be reclassified and discharges of the substance to be outlawed.

BBC: 'Sticky substance' birds rescued in Devon and Cornwall