Ann: Details of Share Registry address, page-3

Apologies for this, but I have been off this thread for a long time. I am wanting to claim my loss relating to my long-term PET shareholding (once at 10 bags!!!! ). Does anyone know if there is a way of doing this? I read somewhere that you have to get a letter from the company saying there's no chance of a relisting and hence one won't be able to sell on market. Not sure if this accurate. Any advice would be great. Thanks