Hi Mate
Contact your local Parex rep and ask them..... there are several Parex outlets all around the UK, some will stock more options than others.... I am sure they will deliver for a cost....
Assume that if you usually use Penlaws, you are based in the SE.....
If you need your Parex contacts details, call Penlaw and ask for the details, or give me a call and I will try to help out for you.
Richard Lord
Aquapanel Spec Managare
07918766577