Hotpoint washing machine WMA46P Aquarius Extra - Door Seal Replacement?

I would like to replace the door seal on washing my Hotpoint WMA46P aquarius Extra, however, it appears that the outer seal securing wire is held in place by a plastic retainer situated just above the top of the seal. Could you advise how the securing wire can be unclipped, and whether the seal is also secured elsewhere.
Many thanks in anticipation of a reply